A good transmission washer prevents leaks, reduces noise, and matches OEM fit for trouble-free service.
Choose washers that crush predictably, resist corrosion, and fit common drain plugs without guessing.
This guide highlights top transmission washers for 2026, the sizes and materials that matter, and clear steps for swapping them correctly.
Follow these tips to stop leaks and keep transmission maintenance simple.
| Transmission Fluid Drain Plug Crush Washer for Honda |
| Reliable Replacement | Material: Aluminum | Inner Diameter (ID): 18 mm (0.71 in) | Outer Diameter (OD): 25.5 mm (1.00 in) | VIEW LATEST PRICE | Read Our Analysis |
| 15pc Transmission & Differential Drain Plug Crush Washers |
| Broad Compatibility | Material: High-grade aluminum alloy | Inner Diameter (ID): 18 mm (0.70 in) | Outer Diameter (OD): 25.5 mm (1.0 in) | VIEW LATEST PRICE | Read Our Analysis |
| Rear Differential & Transmission Drain Plug Washer Gasket Set | Dual-Purpose Set | Material: Aluminum | Inner Diameter (ID): 18 mm (for PN 90471-PX4-000) | Outer Diameter (OD): 25.5 mm (for PN 90471-PX4-000) | VIEW LATEST PRICE | Read Our Analysis | |
| 20-Pack 18mm Transmission Drain Plug Crush Washers |
| Bulk Pack | Material: Aluminum (premium alloy) | Inner Diameter (ID): 18 mm | Outer Diameter (OD): 25.5 mm (18 mm size designation) | VIEW LATEST PRICE | Read Our Analysis |
| Transmission Fluid Drain Plug Crush Washers for Honda |
| DIY Favorite | Material: High-quality aluminum | Inner Diameter (ID): 18 mm (0.71 in) | Outer Diameter (OD): 25.5 mm (1.00 in) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Transmission Fluid Drain Plug Crush Washer for Honda
Should you drive a Honda or Acura and you want a straightforward, reliable way to stop transmission fluid drips, this crush washer is made for you. You’ll find these aluminum washers fit OEM part numbers like 90471-PX4-000 and 94109-20000, and they work on CR-V, Civic, Pilot, and many more models. They measure 25.5 mm outside, 18 mm inside, and 1.95 mm thick, so they seal snugly on drain plugs. You’ll like the corrosion resistance and heat tolerance, which keep oil cleaner. Sold in packs of ten, they give you spares and save time during service.
- Material:Aluminum
- Inner Diameter (ID):18 mm (0.71 in)
- Outer Diameter (OD):25.5 mm (1.00 in)
- Intended Use / Application:Transmission fluid drain plug crush washer
- Compatibility (Vehicle Brands):Honda & Acura models
- Pack Quantity (multiple pieces):10 pieces
- Additional Feature:Direct OEM replacements
- Additional Feature:Pack of ten
- Additional Feature:Corrosion-resistant aluminum
15pc Transmission & Differential Drain Plug Crush Washers
Should you want a reliable, long-lasting seal for your transmission or rear differential drain plug, these 15 aluminum crush washers are a great choice because they’re made to fit tightly and last longer than rubber or plastic options. You’ll get 15 pieces sized 18 mm with inner diameter 0.70 in outer 1.0 in and thickness 0.078 in. They use high-grade aluminum alloy and meet strict quality checks so they crush and seal predictably. They fit many Honda and Acura models from 1990 to 2022. You’ll find installation snug and flush helping prevent leaks and reducing future maintenance.
- Material:High-grade aluminum alloy
- Inner Diameter (ID):18 mm (0.70 in)
- Outer Diameter (OD):25.5 mm (1.0 in)
- Intended Use / Application:Transmission oil pan & rear differential drain plug washer
- Compatibility (Vehicle Brands):Honda & Acura models
- Pack Quantity (multiple pieces):15 pieces
- Additional Feature:Fits differential applications
- Additional Feature:Covers 1990–2022 models
- Additional Feature:High-grade aluminum alloy
Rear Differential & Transmission Drain Plug Washer Gasket Set
Dual-Purpose Set
View Latest PriceShould you drive an Acura or Honda and want a simple, durable fix for oil leaks, this rear differential and transmission drain plug washer gasket set is made for you. You get 12 flat aluminum washers, six sized 24x32x1 mm and six sized 18×25.5×2 mm, matching Acura OEM 94109-2000 and 90471-PX4-000. You’ll like the smooth, wear resistant metal that handles heat and cold and offers better sealing than plastic. Use them on sump plugs, fuel or hydraulic fittings, and transmission drains. Check your drain plug dimensions before installation. Vrasly backs them with a 30 day return promise.
- Material:Aluminum
- Inner Diameter (ID):18 mm (for PN 90471-PX4-000)
- Outer Diameter (OD):25.5 mm (for PN 90471-PX4-000)
- Intended Use / Application:Rear differential & automatic transmission drain plug washer gasket
- Compatibility (Vehicle Brands):Acura/Honda models
- Pack Quantity (multiple pieces):12 pieces (6 + 6 set)
- Additional Feature:Dual-size kit included
- Additional Feature:Vrasly brand/manufacturer
- Additional Feature:30-day return guarantee
20-Pack 18mm Transmission Drain Plug Crush Washers
Should you work on Hondas or Acuras a lot, this 20-pack of 18 mm transmission drain plug crush washers is made to save you time and worry. You’ll get twenty 90471-PX4-000 aluminum washers sized to fit transmission and rear differential drain plugs, so you won’t run out mid-service. They’re made from premium aluminum alloys and meet OEM quality standards, so you can trust the seal. They fit many models like Accord, Civic, CR-V, Pilot, Odyssey, Ridgeline, Element, Integra, TLX, and MDX. DCWecher offers professional quality parts that feel reliable and keep routine maintenance simple and steady.
- Material:Aluminum (premium alloy)
- Inner Diameter (ID):18 mm
- Outer Diameter (OD):25.5 mm (18 mm size designation)
- Intended Use / Application:Transmission fluid / rear differential drain plug crush washer
- Compatibility (Vehicle Brands):Honda & Acura (examples include Accord, Civic, CR-V etc.)
- Pack Quantity (multiple pieces):20 pieces
- Additional Feature:OEM-quality tested
- Additional Feature:Pack of twenty
- Additional Feature:DCWecher branded
Transmission Fluid Drain Plug Crush Washers for Honda
Should you own a Honda or Acura and like doing basic maintenance yourself, these 24 Transmission Fluid Drain Plug Crush Washers are a smart, practical choice that gives you confidence and saves time. You get 24 pieces, each with a 25.5 mm outside diameter and 18 mm inner diameter, part number 90471-PX4-000. They fit Accord, Civic, CR-V, Odyssey and many Acura models, so you can check fitment and feel secure. Made with quality materials and professional manufacturing, they seal reliably. Installation is simple, so you can replace gaskets yourself, avoid a shop visit, and get back on the road.
- Material:High-quality aluminum
- Inner Diameter (ID):18 mm (0.71 in)
- Outer Diameter (OD):25.5 mm (1.00 in)
- Intended Use / Application:Transmission fluid drain plug crush washer
- Compatibility (Vehicle Brands):Honda & Acura (Accord, Civic, CR-V, Odyssey noted)
- Pack Quantity (multiple pieces):24 pieces
- Additional Feature:Pack of twenty-four
- Additional Feature:DIY-friendly installation
- Additional Feature:Professional manufacturing
Factors to Consider When Choosing Car Transmission Washers
As you pick transmission washers, consider the material and durability initially so they won’t fail under stress. Make sure the size matches exactly and that they’re compatible with OEM standards to avoid leaks and fit problems. Also check sealing performance and temperature resistance so your transmission stays protected in everyday driving.
Material And Durability
Because your transmission lives in a hot, dirty place, picking the right washer material and grasping how long it will last matters a lot to keeping leaks away and your mind at ease. You’ll find aluminum crush washers are a smart choice. They deform to form a tight seal and resist heat and corrosion better than rubber or plastic. Thicker washers, around 1 to 2 mm, give more material to deform and can reseal more reliably whenever you tighten the drain plug. Metal alloys with good ductility strike a balance between easy crushability and lasting through heat cycles and fluid exposure. Still, expect to replace these washers at each service, since repeated deformation lowers sealing effectiveness and raises leak risk.
Correct Size Match
You’ve learned why material and durability matter, and now you’ll want to match the washer size to the drain plug and pan so the seal actually works. Start measuring the drain plug shaft and the original washer. Match the inner diameter to the plug shaft. Common sizes include 18 mm and 24 mm, and fitting the shaft prevents the washer from sitting on the pan opening instead of the plug. Check outer diameter and thickness so the washer crushes evenly. Typical OD and thickness values help guide you, for example around 25.5 mm OD and 1.95 to 2.0 mm thick. Use the exact washer type intended for transmission or differential ports. Pick a washer that crushes to a flush fit without extruding into the drain hole.
OEM Part Compatibility
Should you want the new washer to seal like the original, start confirming it lists the OEM part number your vehicle’s service manual references and matches the exact inner diameter and thickness specified. Then check material and fit. Match aluminum crush washers whenever your manual calls for them. They handle heat and pressure better than other metals and compress predictably. Also verify outer diameter and flat-face profile so the washer sits flush against the pan or housing seat. In the event it over-compresses you get leaks. For cars with multiple drain plugs, pick the correct part number and size for each location instead of assuming one fits all. These steps keep you confident and reduce the chance of leaks or repeat jobs.
Sealing Performance
Now that you’ve checked OEM compatibility and fit, let’s look at what actually makes a washer seal well so you can avoid leaks and needless repeat work. You want a malleable metal like aluminum that deforms under torque to fill threads and mating surfaces, forming a reliable metal to metal seal. Thickness matters too. Choose washers around 1.9 to 2.0 mm so they compress without bottoming out. Inner and outer diameters must match the drain plug and bore, often near 18 mm ID and 25.5 mm OD, for full contact and no bypass leakage. Smooth, flat faces reduce leak paths compared with warped or scratched parts. Keep in mind these are single use; reusing a crushed washer raises leak risk and frustration.
Temperature Resistance
Whenever you pick a transmission washer, consider about how hot your system gets and how often it heats up and cools down, because temperature affects how the metal behaves and whether the seal will hold. You’ll find aluminum works well for most drain jobs, handling continuous heat up to about 150–200°C. Should you expect occasional extreme spikes, choose stainless steel or copper since they tolerate short bursts above 300°C. Pay attention to thermal cycling too, because repeated heating and cooling can harden or crack washers over time. Also match coefficients of thermal expansion whenever possible, so the washer and surrounding parts expand similarly and reduce stress on the seal. These choices keep leaks down and give you real peace of mind.
Quantity And Value
A handful of smart choices about quantity and value will save you time and money as you pick transmission washers, so start from counting every service point on your vehicle and planning for at least one spare per drain plug. Count pan bolts, differential plugs, and transfer case points, then add spares for mistakes. Buy packs that match how often you work on cars. Small packs of six to ten suit the occasional DIYer. Larger packs of twenty to twenty four give better cost per washer should you service multiple vehicles. Check the math through dividing pack price against piece count so you know the true value. In case your vehicle needs two sizes, choose mixed packs or multiple packs to avoid repeated single purchases. Keep two to four extras per vehicle to prevent delays.
Installation Ease
At any time you pick transmission washers, consider about how easy they are to install, because a washer that fits and seats quickly will save you time and cut stress during a fluid change. You’ll want washers made from aluminum or copper since those soft metals deform to form a tight seal with simple hand-tightening or a torque wrench. Check inner and outer diameters and thickness so the washer sits flush without overhang or getting crushed too thin. Always swap the washer whenever you drop the drain plug because reused crush washers can leak. Follow the manufacturer torque spec so you don’t flatten or under-compress the washer. Before you fit a new washer, clean the mating surface of burrs, corrosion, and debris for smooth seating.
