Needle seat assemblies control fuel flow and seal the carburetor bowl on Holley and many small engines. This list highlights ten reliable options for 2026, available in packs from 2 to 20, with brass or plated seats and Viton or nitrile tips suited for ethanol blends.
Match OEM numbers like 398188, 281144, and Rochester VN54R, check bore and seal thickness, and aim for roughly 1.5 mm gasket thickness for solid sealing. Keep spare assemblies on hand for fleet work and easier installs.
| Carburetor Needle Seat & Gasket Kit for Holley |
| Best For Holley | Part Type: Needle, seat & gaskets kit | Quantity per Package: 10 sets (20 pieces total) | Replacement Part Numbers (compatibility): Fits Holley models (no OEM number listed) | VIEW LATEST PRICE | Read Our Analysis |
| Pack of 4 Carburetor Float Valve Needle Seat Kit for 398188 281144 |
| Great For Briggs & Stratton | Part Type: Needle + needle seat assemblies | Quantity per Package: 4 assemblies | Replacement Part Numbers (compatibility): 398188, 281144 | VIEW LATEST PRICE | Read Our Analysis |
| Carbhub Carburetor Needle Seat 398188 (20pcs) |
| Bulk Replacement Pack | Part Type: Needle seat only | Quantity per Package: 20 seats | Replacement Part Numbers (compatibility): 398188, 281144, 299096, 394681, 83400 | VIEW LATEST PRICE | Read Our Analysis |
| Anxingo Carburetor Float Needle Valve Seats (20-Pack) |
| Wide Compatibility | Part Type: Needle seat only | Quantity per Package: 20 seats | Replacement Part Numbers (compatibility): 398188, 281144, 299096, 394681 (plus many others) | VIEW LATEST PRICE | Read Our Analysis |
| 10 Pcs Carburetor Float Valve Needle Seat for 398188 281144 |
| Mid-Size Pack | Part Type: Needle seat only | Quantity per Package: 10 seats | Replacement Part Numbers (compatibility): 398188, 281144 | VIEW LATEST PRICE | Read Our Analysis |
| Tomco 556A Carburetor Needle and Seat Assembly |
| OEM-Style Quality | Part Type: Needle and seat assembly (with gasket) | Quantity per Package: 1 assembly | Replacement Part Numbers (compatibility): VN54R / VN56R / VN145R / 30-134 / 93-556R etc. | VIEW LATEST PRICE | Read Our Analysis |
| Panari Carburetor Float Valve Needle Seat Kit (12) |
| Best Value Pack | Part Type: Needle + needle seat kit | Quantity per Package: 12 assemblies (24 pieces total) | Replacement Part Numbers (compatibility): 398188, 281144 (and related Briggs & Stratton numbers) | VIEW LATEST PRICE | Read Our Analysis |
| Panari Carburetor Float Valve Needle Seat Kit (2-Pack) |
| Small-Quantity Spare | Part Type: Needle + needle seat kit | Quantity per Package: 2 assemblies (4 pieces total) | Replacement Part Numbers (compatibility): 398188, 281144, 398183, 490937, 498261 | VIEW LATEST PRICE | Read Our Analysis |
| Mtsooning Carburetor Needle Seat Bowl Gasket Kit |
| Complete Repair Kit | Part Type: Needle, seat, gaskets, diaphragm kit | Quantity per Package: Single kit (contains multiple components) | Replacement Part Numbers (compatibility): Tecumseh 631021 / 631021A / 631021B; Eska 631031B; Oregon 49-916; 525-212 | VIEW LATEST PRICE | Read Our Analysis |
| ZCZQC Carburetor Float Valve Needle Seat Kit (2pcs) |
| Compact Replacement | Part Type: Needle + needle seat kit | Quantity per Package: 2 assemblies | Replacement Part Numbers (compatibility): 398188, 281144 | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Carburetor Needle Seat & Gasket Kit for Holley
Should you want a straightforward, reliable rebuild for a Holley carburetor, this 10-set Carburetor Needle, Seat and Gasket Kit is made for you. You get 10 top gaskets 1008-777 and 10 bottom boot gaskets 1008-778, twenty pieces total. You’ll fit Holley 2300, 4150, 4160, and 4500 models that use adjustable needles and seats. The gaskets are made from high-quality material, one point five mm thick, so they resist crumbling and leaking. You can replace both top and bottom gaskets during a needle and seat rebuild, and you’ll feel confident aware the kit matches common Holley needs.
- Part Type:Needle, seat & gaskets kit
- Quantity per Package:10 sets (20 pieces total)
- Replacement Part Numbers (compatibility):Fits Holley models (no OEM number listed)
- Compatible Engine/Equipment Families:Holley carburetors (2300, 4150, 4160, 4500)
- Intended Use:Needle & seat rebuild / gasket replacement
- Aftermarket / Replacement Status:Aftermarket replacement kit
- Additional Feature:Includes top and bottom gaskets
- Additional Feature:Fits Holley 2300/4150/4160/4500
- Additional Feature:Gasket thickness 1.5 mm
Pack of 4 Carburetor Float Valve Needle Seat Kit for 398188 281144
In case you want a simple, reliable fix for a running or flooding carburetor, this pack of four needle and seat assemblies is ideal for small-engine owners who value doing the job right the outset. You get four complete needle and seat assemblies labeled for 398188 and 281144, so you can replace worn parts without guessing. They fit Briggs & Stratton AllMax, Quantum, 5 and 6 HP vertical engines, plus 3.5 and 5 HP Industrial Plus models. They also work on many Toro mowers and snow throwers listed on the package. You’ll feel confident installing them and getting your engine steady.
- Part Type:Needle + needle seat assemblies
- Quantity per Package:4 assemblies
- Replacement Part Numbers (compatibility):398188, 281144
- Compatible Engine/Equipment Families:Briggs & Stratton AllMax/Quantum; 5HP/6HP vertical; 3.5/5HP Industrial Plus; Toro models
- Intended Use:Float valve (needle) replacement in carburetor
- Aftermarket / Replacement Status:Aftermarket replacement assemblies
- Additional Feature:Four complete assemblies
- Additional Feature:Toro lawn mower compatibility
- Additional Feature:Toro snowthrower compatibility
Carbhub Carburetor Needle Seat 398188 (20pcs)
Should you work on small engines and want a simple, reliable fix, the Carbhub 398188 needle seat pack is a smart choice for DIYers and pros alike. You get twenty new aftermarket needle seats that replace 398188, 281144, 299096, 394681, and 83400, so you can swap parts without guesswork. They fit common 5HP and 6HP vertical engines plus 3.5HP and 5HP Industrial Plus models, and they sit in the carburetor float valve to control fuel flow. You’ll appreciate the steady fit, easy installation, and the confidence of keeping engines running smoothly with spares on hand.
- Part Type:Needle seat only
- Quantity per Package:20 seats
- Replacement Part Numbers (compatibility):398188, 281144, 299096, 394681, 83400
- Compatible Engine/Equipment Families:5HP/6HP vertical; 3.5/5HP Industrial Plus
- Intended Use:Replacement needle seat for float valve
- Aftermarket / Replacement Status:Aftermarket replacement seats
- Additional Feature:Pack of 20 seats
- Additional Feature:Replaces multiple OEM numbers
- Additional Feature:For small vertical engines
Anxingo Carburetor Float Needle Valve Seats (20-Pack)
Should you’re repairing a small engine and want a reliable, budget-friendly replacement, the Anxingo 20-pack of carburetor float needle valve seats is a solid choice for home mechanics and small shop owners. You’ll get twenty needle seats that fit OEM 398188 and many other part numbers, so you can tackle multiple repairs without hunting parts. They suit 5 HP and 6 HP vertical engines and several Industrial Plus models, so compatibility is broad. Check your model number and the product image before you buy, and contact the seller in case you have questions. Keep spares on hand for quick, calm fixes.
- Part Type:Needle seat only
- Quantity per Package:20 seats
- Replacement Part Numbers (compatibility):398188, 281144, 299096, 394681 (plus many others)
- Compatible Engine/Equipment Families:5HP/6HP vertical; 3.5/5HP Industrial Plus
- Intended Use:Replacement needle seat for float valve
- Aftermarket / Replacement Status:Aftermarket replacement seats
- Additional Feature:Wide OEM replacements list
- Additional Feature:Pack of 20 pieces
- Additional Feature:Buyer fitment reminder
10 Pcs Carburetor Float Valve Needle Seat for 398188 281144
You’ll appreciate this 10 pack of carburetor float valve needle seats in case you work on small engines or do regular maintenance, because it gives you reliable, ready-to-install replacements that match OEM numbers 398188 and 281144. You’ll find these fit Max and Quantum series engines and several vertical and Industrial Plus models, so you won’t worry about frequent trips to the parts store. Each aftermarket piece is made to be a direct replacement, so you can swap them quickly and get the engine running. Just verify part numbers and engine model before installation to avoid surprises and save time.
- Part Type:Needle seat only
- Quantity per Package:10 seats
- Replacement Part Numbers (compatibility):398188, 281144
- Compatible Engine/Equipment Families:Max/Quantum series; 5HP/6HP vertical; 3.5/5HP Industrial Plus
- Intended Use:Replacement needle seat for carburetor float valve
- Aftermarket / Replacement Status:Aftermarket replacement seats
- Additional Feature:Pack of 10 seats
- Additional Feature:Fits Max/Quantum series
- Additional Feature:Direct aftermarket replacement
Tomco 556A Carburetor Needle and Seat Assembly
In case you own or work on Rochester carburetors and want a dependable replacement that snaps into place without fuss, the Tomco 556A Carburetor Needle and Seat Assembly is a strong choice. You get a brass needle, seat, and gasket in one kit, so you can swap parts without hunting for extras. It fits many Rochester numbers like VN54R and 7035148, so chances are good it matches your carburetor. It weighs just 1.6 ounces and has been available since 2018. You’ll appreciate straightforward installation, durable brass materials, and the option to check warranty or return details should the need arise.
- Part Type:Needle and seat assembly (with gasket)
- Quantity per Package:1 assembly
- Replacement Part Numbers (compatibility):VN54R / VN56R / VN145R / 30-134 / 93-556R etc.
- Compatible Engine/Equipment Families:Rochester carburetors (Rochester make/models listed)
- Intended Use:Replace needle and seat in Rochester carburetors
- Aftermarket / Replacement Status:OEM/brand (Tomco) replacement assembly
- Additional Feature:Brass needle and seat
- Additional Feature:Includes gasket with assembly
- Additional Feature:Rochester carburetor fit
Panari Carburetor Float Valve Needle Seat Kit (12)
In case you want a straightforward, reliable fix for worn carburetor seats on older Briggs and Toro engines, the Panari Carburetor Float Valve Needle Seat Kit (pack of 12) is a smart choice that gets you back to mowing and clearing snow fast. You’ll get 12 needle valves and 12 seats, enough for multiple repairs. It replaces Briggs 398188 and fits many Max Quantum and Industrial Plus engines, plus several Toro mower and snowthrower models. You should verify part numbers before buying. The kit is light, well reviewed, not discontinued, and carries a manufacturer warranty with a 30 day return option.
- Part Type:Needle + needle seat kit
- Quantity per Package:12 assemblies (24 pieces total)
- Replacement Part Numbers (compatibility):398188, 281144 (and related Briggs & Stratton numbers)
- Compatible Engine/Equipment Families:All Max/Quantum; 5HP/6HP vertical; 3.5/5HP Industrial Plus; Toro
- Intended Use:Replace carburetor float valve needle & seat
- Aftermarket / Replacement Status:Aftermarket replacement kit
- Additional Feature:12 needles + 12 seats
- Additional Feature:Item model PD-24322
- Additional Feature:Compact lightweight package
Panari Carburetor Float Valve Needle Seat Kit (2-Pack)
Should you want a simple, reliable fix for a gumming or leaking carburetor on small Briggs & Stratton or Toro engines, the Panari Carburetor Float Valve Needle Seat Kit (2-Pack) is a smart choice because it replaces several common OEM part numbers and fits many engine families. You’ll get two needle valves and two seats, light and compact, easy to stash. It fits many Briggs & Stratton model ranges and specific Toro snowthrower and mower part numbers, so you can swap parts confidently. Check your engine model before buying, contact the seller with questions, and enjoy smoother starts and fewer leaks.
- Part Type:Needle + needle seat kit
- Quantity per Package:2 assemblies (4 pieces total)
- Replacement Part Numbers (compatibility):398188, 281144, 398183, 490937, 498261
- Compatible Engine/Equipment Families:All Max/Quantum; 5HP/6HP vertical; BS 3.5/5HP Industrial Plus; Toro
- Intended Use:Replace carburetor float valve needle & seat
- Aftermarket / Replacement Status:Aftermarket replacement kit
- Additional Feature:Pack of 2 assemblies
- Additional Feature:Replaces extra Briggs numbers
- Additional Feature:Seller support/verification note
Mtsooning Carburetor Needle Seat Bowl Gasket Kit
Should you’re rebuilding a small engine carburetor and want reliable parts that fit Tecumseh and compatible models, the Mtsooning Carburetor Needle Seat Bowl Gasket Kit is a strong choice for home mechanics who value a straightforward repair. You get a needle, seat, gaskets, and diaphragm so you can replace worn parts in one go. It matches Tecumseh 631021 variants and several model lines like H30 V40 and VM100, so you’ll likely find fitment. Check the images and descriptions before you buy. The kit is light, comes with seller warranty info, and includes a 30 day return option.
- Part Type:Needle, seat, gaskets, diaphragm kit
- Quantity per Package:Single kit (contains multiple components)
- Replacement Part Numbers (compatibility):Tecumseh 631021 / 631021A / 631021B; Eska 631031B; Oregon 49-916; 525-212
- Compatible Engine/Equipment Families:Tecumseh/Eska/Oregon small-engine models listed
- Intended Use:Rebuild carburetor needle/seat and gaskets (bowl gasket & diaphragm included)
- Aftermarket / Replacement Status:Aftermarket replacement kit
- Additional Feature:Includes diaphragm and gaskets
- Additional Feature:Replaces Tecumseh/Oregon parts
- Additional Feature:Fits many Tecumseh models
ZCZQC Carburetor Float Valve Needle Seat Kit (2pcs)
You’ll appreciate the ZCZQC Carburetor Float Valve Needle Seat Kit whenever you desire a simple, reliable fix for small-engine fuel leaks or erratic idling, especially in case you work on lawn mowers, snowthrowers, or small Briggs and Stratton engines. You get two CFVNSK-2 seats that replace numbers 398188 and 281144. They fit many Briggs and Stratton and Toro models, including listed snowthrowers and many lawn mowers, so check your model before buying. The seats are compact, translucent, and smooth, showing careful workmanship. They weigh almost nothing and come in a slim package. Ask the seller about warranty and reviews.
- Part Type:Needle + needle seat kit
- Quantity per Package:2 assemblies
- Replacement Part Numbers (compatibility):398188, 281144
- Compatible Engine/Equipment Families:All Max/Quantum; 5HP/6HP vertical; BS 3.5/5HP Industrial Plus; Toro
- Intended Use:Replace carburetor float valve needle & seat
- Aftermarket / Replacement Status:Aftermarket replacement kit
- Additional Feature:Smooth translucent finish
- Additional Feature:Compact CFVNSK-2 model
- Additional Feature:Extensive Toro fitment list
Factors to Consider When Choosing Carburetor Needle Seat Assemblies
Whenever you pick a carburetor needle seat assembly, consider initially about material and durability because a strong seat lasts longer and stands up to wear. Also check compatibility and fitment along with seal thickness and design so the part mates correctly and controls fuel flow without leaks. Finally, consider corrosion and fuel resistance plus the quantity and value you get, since a good balance of quality and supply saves you time and money.
Material And Durability
Although carburetor needle seats could look small, their material and durability determine how well your engine will run over time. You want brass seats because they resist corrosion and wear better than many plastics, giving longer service life where fuel sits. Pair brass with Viton or Buna-N rubber tips on needles and you’ll get stronger chemical resistance to ethanol blends, so the tip won’t swell or leak. Pay attention to hardness and tolerances of the needle tip and seat bore measured in thousandths of an inch because tighter machining yields a better seal and fewer fuel leaks. Also check surface finish and plating like nickel or chrome since smoother plated surfaces reduce wear and improve long term sealing performance.
Compatibility And Fitment
Because small differences make a big impact, you should confirm compatibility and fitment before buying a carburetor needle seat assembly. Start by checking the needle seat part number or OEM reference in your engine or carburetor manual. Seats are not universal, and tiny changes in diameter or taper stop proper sealing. Next, match the seat type to your carburetor design, since adjustable versus nonadjustable needles and straight versus angled seats change how the needle contacts the seat and meters fuel. Also verify engine family and displacement, because manufacturers vary assemblies across power ranges. Measure bore diameter, overall length, and inlet orientation against the original to protect float height and mechanical fit. Finally, confirm the replacement includes matching needles, gaskets, or boots to avoid leaks.
Seal Thickness And Design
Should you want your engine to run clean and avoid hard starting, pay close attention to seal thickness and design in the needle seat assembly. You’ll find thicker seals around 1.5 mm last longer and handle small seat flaws, while thinner seals hug fine machined surfaces better but wear sooner. Material choice and cross section matter because molded boots and flat gaskets compress differently and react to gasoline and ethanol blends in different ways. Match seal profile and surface finish to the needle geometry, or you’ll get intermittent leaks and float shifts. Also consider durometer and compression set resistance: a soft seal seats easily but deforms, a hard one resists set but might not seal under light compression. Finally, install with correct torque and stack height so seal thickness keeps float cut off precise.
Corrosion And Fuel Resistance
Whenever you pick a needle seat assembly, consider initially about how metal and rubber will stand up to fuel and moisture, because the wrong combo will leave you with leaks and stuck floats. You want stainless steel, brass, or nickel plated alloys because they resist rust and pitting from ethanol blends and water. Also check for plated or passivated surfaces and tight machining tolerances so the seat bore stays smooth and the needle stays concentric. For seals, choose Viton or nitrile NBR so gaskets and boots won’t swell or harden. Match parts to your expected fuel and ethanol level, especially above E10. Finally verify compatibility with common additives and long term storage to avoid corrosion from phase separated water and stabilizers.
Quantity And Value
A good rule of thumb is to buy based upon how many carburetors you plan to fix and how often you want to avoid emergency repairs. You should match pack quantity to project needs, whether you rebuild one engine or service a fleet. Calculate cost per usable assembly by dividing package price against needle and seat pairs. That helps you compare value across sizes. Keep spares on hand, aiming for two to three extra assemblies per engine type to cut downtime. Add a 10 to 20 percent buffer for installation mistakes or damaged parts. Balance unit price with quality; cheaper bulk packs can save money now but could mean more frequent replacements. Consider how often you work and how much risk you’ll accept.
