How can I be sure this drain cap will fit my Vanagon Westfalia?

To ensure proper fitment, this drain cap is specifically designed for 1988-91 Vanagon Westfalia models. The key detail is the thread count: your fresh water tank’s drain pipe must have 3 threads per 1/2 inch (sometimes called "coarse thread"). If your drain pipe has 5 threads per 1/2 inch (fine thread), this cap will not fit. Double-check your original cap or the threads on your tank before buying for a perfect match.

Is this the original drain cap or an aftermarket replacement?

This is a high-quality aftermarket replacement for the original Vanagon Westfalia fresh water tank drain cap. It is made by Quality Aftermarket to the correct specifications (part number 255-070-802B), so it fits and functions just like the original 35mm cap. It’s a great choice for restoring or maintaining your camper’s plumbing system, especially since this hard-to-find part is rarely in stock.

How do I install the fresh water tank drain cap on my camper?

Installation is quick and straightforward—simply screw the drain cap onto the tank’s drain pipe by hand. Ensure the threads on both the cap and the tank are clean and free from debris for a watertight seal. Turn the cap clockwise until snug; it shouldn’t require tools. If you feel significant resistance or the threads don’t align, double-check that your tank matches the cap’s 3 threads per 1/2 inch specification. That’s all you need to keep your fresh water system secure and leak-free!

White plastic threaded cap with textured black gasket, automotive replacement part

White plastic grooved cap for vehicle water tank, isolated on white background

Close-up of vehicle undercarriage on a lift showing suspension and exhaust system details

Thumbnail of White plastic threaded cap with textured black gasket, automotive replacement part

Thumbnail of White plastic grooved cap for vehicle water tank, isolated on white background

Thumbnail of Close-up of vehicle undercarriage on a lift showing suspension and exhaust system details

Fresh Water Tank Drain Cap

Product:	255-070-802B
Works With:	1988-1991
Manufacturer:	Quality Aftermarket
Restock ETA:
Availability:

Proposition 65: This product may contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm.

These incredibly hard-to-find fresh water drain caps are finally back! Get 'em while the getting is good.

Fits: 1988-91 Vanagon Westfalia ONLY.

Before you order, please take a moment to verify the "coarseness" of the threads on your drain pipe. This cap has 3 threads per 1/2", while the other caps that were used on some tanks have 5 threads per 1/2". Unfortunately, we no longer offer the other size of drain cap.

Water Storage Tank and Hook-Up Box [Westfalia]

Reference numbers can be OE part numbers, superseded part numbers, and compatible part numbers. We provide this information to help ensure you're getting the right part for your needs.

255-070-802B
255070802B

Fresh Water Tank Drain Cap

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