Answering the common question, these crush washers ensure a reliable seal on the oil drain plug during transmission or rear differential fluid changes. This guide highlights five top options and who they’re best for, helping you choose the right size and material for your vehicle. Whether you’re a weekend DIYer or a professional, select washers that match your OEM part numbers and fitment needs. The top picks below are chosen for broad compatibility, sealing performance, and easy substitutes for common Honda/Acura, Toyota, and other models.
Buyer table at a glance: the chosen products offer 18 mm or 20 mm inner diameters with 25.5 mm outer (or larger) and aluminum construction for durable seals. They cover Honda/Acura, Toyota/Lexus, and various other makes as listed in the product features. This quick reference helps buyers compare fitment, material, and typical use cases.
RARAYC 24 Pcs Transmission Drain Plug Crush Washer Set
Features include 24 pieces of OEM-style crush washers matching part 90471-PX4-000. Outer diameter is 25.5 mm (1 inch) and inner diameter is 18 mm (0.71 inch). This set targets Honda Accord, Civic, Acura and similar models. Best for bulk replacements during multiple fluid changes or for shop stock.
Why it’s selected: The large quantity reduces the risk of reusing worn washers, and the standardized dimensions fit common Honda/Acura drain plugs. Best for: DIYers performing frequent changes or small shops needing plenty of spares. Caution: Verify model compatibility for non-Honda vehicles; misfit washers may seal poorly.
BSAMZO 12-Piece and 6-Piece Rear Differential Crush Washer Kit
This kit includes 6 pieces of 18 mm washers for transmission plugs and 6 pieces of 20 mm washers for rear differentials. It is designed to fit OEM 90471-PX4-000 and 94109-2000, with aluminum material and smooth surfaces for better sealing. Best for: owners with both transmission and rear differential service needs across Honda/Acura and similar models.
Why it’s selected: The dual-diameter approach provides coverage across two common plug sizes, reducing need for multiple separate orders. Caution: Confirm exact inner diameter on your drain plug before ordering; incorrect size can compromise seal.
CmeRto 12-Piece Oil Drain Plug Crush Washer Kit
Includes 12 washers designed for 90471-PX4-000 (18 mm) and 94109-2000 (20 mm) replacements. Aluminum construction offers a smooth seal with good wear resistance suitable for high-temperature operations. Best for: Acura and Honda models that often use 18 mm or 20 mm plug washers, plus occasional broader compatibility across similar makes.
Why it’s selected: The kit provides explicit 18 mm and 20 mm options with precise dimensions, aiding accurate fitment. Caution: The 12157-10010 and other Toyota/Lexus references in other kits are not applicable here; verify compatibility with your car’s specific drain plug.
AOIT Transmission Drain Plug Crush Washer Set
This pack emphasizes seamless substitution for several OEM washers, replacing 90471-PX4-000, 94109-20000, 90471PX4000, and other related part numbers. It covers broad Honda/Acura ranges such as CR-V, Civic, Odyssey, Pilot, and more. Best for: drivers seeking a direct OEM-equivalent seal without guessing the correct size.
Why it’s selected: The listing highlights multiple OEM numbers, aiding quick decision-making for common Honda/Acura service. Caution: Ensure the exact inner diameter matches your drain plug to avoid leaks.
DCWecher 20-Pack 9047-PX4000 And 94109-2000 Washers
This set combines 10 pieces of 9047-PX4000 washers (18 mm) and 10 pieces of 94109-2000 washers (20 mm) in a durable aluminum construction. Best for: workshops or households performing both transmission and rear differential service with a focus on OEM-size compatibility.
Why it’s selected: The bundled quantity supports multiple vehicles and fluid changes, while aluminum aids sealing without over-tightening. Caution: The product emphasizes compatibility with certain OEM numbers; verify your exact model before purchasing.
Buying Guide: Key Considerations For Choosing Transmission Crush Washers
What size is right for your drain plug?
Check your drain plug’s inner diameter (commonly 18 mm or 20 mm for many cars). The outer diameter and thickness influence sealing performance and tool clearance. When in doubt, measure the old washer or reference your vehicle’s OEM parts list.
Material matters: aluminum vs. other metals
Aluminum crush washers offer good sealing and resistance to corrosion while being lightweight. They tend to seal well under typical transmission and differential fluid temperatures. Rubber or plastic seals are more prone to deformation and leaks over time. Choose aluminum for long-term reliability.
OEM-number compatibility and model coverage
Look for washers explicitly listed to replace OEM part numbers like 90471-PX4-000 and 94109-2000. If a product claims broad compatibility, double-check that your vehicle model and year are included in the fitment notes. This helps avoid leaks caused by mismatched sizes.
Quantity vs. value: bulk sets
Bulk sets are convenient for frequent fluid changes or shop use. If you only service a single vehicle, a smaller pack may suffice. Consider future maintenance needs when selecting a kit to maximize value.
Installation notes and cautions
Proper torque is essential to prevent leaks. Do not over-tighten; the crush washer should compress adequately to seal without damage. Inspect washers for any distortion before installation.
Choosing based on vehicle type
Honda/Acura owners often rely on 18 mm washers (for 90471-PX4-000), while many Toyota/Lexus models use different sizes. Use product listings that clearly indicate model compatibility and avoid assuming cross-compatibility without verification.
FAQ
- Q: Are crush washers necessary for every oil drain plug change?
A: Yes, to ensure a leak-free seal. Using the correct size and material improves sealing and helps prevent oil leaks during service.
- Q: How do I know which diameter I need—18 mm or 20 mm?
A: Measure your drain plug inner diameter or refer to the OEM part number. Many Honda/Acura plugs use 18 mm, while some Toyota/Lexus models use 20 mm.
- Q: Can I reuse a crush washer?
A: Reuse is not recommended. Crush washers are designed to deform and seal properly on first use; reuse can fail to seal and cause leaks.
- Q: Do these sets work for both transmission fluid and rear differential fluid?
A: Some sets include both 18 mm and 20 mm washers intended for both applications. Always confirm compatibility with your specific implement.
- Q: Is aluminum the best material for a crush washer?
A: Aluminum provides reliable sealing and corrosion resistance with appropriate rigidity. It’s typically preferred over rubber or plastics for metal-to-metal seals.
- Q: Where can I find exact OEM replacement numbers for my car?
A: Check your vehicle’s service manual or parts catalog for part numbers such as 90471-PX4-000 and 94109-2000 to guide your purchase.