Honda Genuine OEM Rear Differential Drain/Fill Plug Washers (20mm), Bag of 10-94109-20000

✔ Honda 94109-20000 Differential Drain/Fill Plug Washers (20mm) — Genuine OEM Part
✔ Fitment: Rear differential drain and fill plugs on Honda and Acura vehicles with 4WD/AWD systems, plus transmission and engine applications
✔ Direct replacement for factory crush washers — no modifications required
✔ Manufactured to Honda's original specifications and tolerances
✔ Bag of 10 washers — convenient bulk pack for multiple services

Honda 94109-20000 Genuine Differential Drain/Fill Plug Washers (20mm) — Bag of 10

A leaking differential fill or drain plug, oil stains under the rear of your vehicle, or a low differential fluid level warning — these are common signs that your differential plug washer is failing. The crush washer is a single-use sealing gasket that compresses to form a leak‑tight seal between the plug and the differential housing. Reusing an old washer can cause fluid leaks, which may lead to differential overheating and premature wear. Replacing it with this genuine Honda washer ensures a proper seal and protects your drivetrain.

This is a factory‑original Honda crush washer (OE part number 94109-20000) with a 20mm inner diameter, specifically designed for drain and fill plugs on rear differentials, transmissions, and select engine applications. It is made from high‑quality copper material that compresses evenly under torque to create a reliable, long‑lasting seal. This is the same washer sold at Honda dealerships.

OEM Part Numbers
• 94109-20000

Vehicle Fitment Table (OEM Compatibility)

⚠️ Important Fitment Notes:

• Always verify the size – This washer is for 20mm plugs. Check the size of your differential plug before ordering. Some models may use a different size washer.

• Single‑use only – This is a crush washer and is designed for one‑time use only. Always install a new washer whenever you remove the differential drain or fill plug.

• Bag of 10 – This listing includes 10 washers. Convenient for multiple services or for stocking your garage.

• Copper construction – Made from high‑quality copper for reliable compression and sealing.

• Double‑check your original part – Before ordering, confirm the part number stamped on your original washer or run your VIN through a Honda OEM parts catalog for absolute certainty.

When to Replace (Common Symptoms)
• The washer is flattened, cracked, or damaged
• Differential fluid is leaking from the drain or fill plug
• Oil stains visible under the rear of the vehicle
• The old washer has been reused (must be replaced)
• You are performing a differential fluid change and need a new washer
• The plug is loose or difficult to tighten due to a worn washer

Product Highlights
• ✔ Genuine Honda OEM part — not an aftermarket or Chinese replica
• ✔ 20mm inner diameter — fits standard Honda differential drain and fill plugs
• ✔ Made from high‑quality copper — compresses evenly for a reliable seal
• ✔ Single‑use crush washer — ensures leak‑tight sealing every time
• ✔ Bag of 10 washers — great value for multiple fluid changes
• ✔ Backed by Honda’s manufacturer warranty (valid through any authorized dealer)

Condition
New (100% genuine Honda packaging)

Product Type
Differential Drain/Fill Plug Washer (Crush Washer / Sealing Gasket)

Function
The crush washer is placed between the differential plug and the housing. When the plug is tightened, the washer compresses and deforms slightly, creating a leak‑tight seal that prevents differential fluid from escaping. It also helps absorb vibration and maintain plug tension.

Applications
This 20mm washer is used on rear differential drain and fill plugs on Honda and Acura 4WD/AWD models, including CR‑V, Pilot, Odyssey, Passport, Ridgeline, MDX, RDX, and TLX. It is also used on select transmission and engine applications.

Important: Always verify the size of your differential plug before ordering. This washer is for 20mm plugs only.

Package Contents
• 10 × Honda 94109-20000 crush washers (genuine)

Technical Specifications

Warranty
Honda's original manufacturer warranty applies. For claims, please contact your nearest Honda authorized dealer with your proof of purchase. Warranty terms may vary by region — contact us before purchase if you need a warranty confirmation.

FAQ

Is this a genuine Honda part or a copy?
This is 100% genuine Honda OEM — in original factory packaging with Honda part number printed on the label. It is not an aftermarket brand or a replica.

Will these washers fit my 2015 Honda CR-V differential?
Yes — the 3rd–5th generation CR-V uses the 20mm washer for the rear differential drain and fill plugs. We recommend verifying your plug size.

Can I reuse the old washer?
No — this is a crush washer and is designed for one‑time use only. Reusing an old washer will cause leaks. Always use a new washer when you remove the plug.

How many washers are in the bag?
This listing includes a bag of 10 washers.

What is the torque spec for the differential plug?
The typical torque spec for the differential drain/fill plug is approximately 35–45 Nm. Always refer to your vehicle's service manual for the exact specification.

Will this washer fit my transmission?
Yes — this washer is also used on select Honda transmission drain/fill plugs. Please verify the plug size on your transmission.

Are these washers the same as the engine oil drain plug washer?
No — the engine oil drain plug typically uses a smaller washer (usually 14mm or 16mm). This washer is 20mm and is designed for differential and transmission applications.

Can I use this washer for other 20mm plugs?
Yes — this washer can be used on any 20mm drain or fill plug that requires a copper crush washer, provided the plug and housing are designed for this washer.

How do I install the washer?
Place the new washer onto the plug, then thread the plug into the differential housing. Tighten to the specified torque from your service manual. The washer will compress and form a seal as the plug is tightened.