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!

Drain cap for fresh water tank 35mm

Name: Fresh Water Tank Drain Cap
SKU: 255-070-802B
Price: 14.95 USD
Availability: InStock

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

Fresh Water Tank Drain Cap

Product:	255-070-802B
Works With:	1988-1991
Manufacturer:	Quality Aftermarket
Availability:	Good Stock

$14.95

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

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As advertised. Fit perfectly

Exelente!!

Sure glad GoWesty had this! As like another reviewer, I couldn’t find anything else that would work in its thread size! Guess that’s why the van’s previous owner had the cracked cap limping along, wrapped in packing tape 😂

Fits perfect

Needed this for back up. Fit great and will serve its purpose.

Great quality.

Fits exactly right

Perfect for the job to replace the crumbled original!

Just in case.

Grabbed a spare in case the nearly 40 year old one finally cracks.

Drain cap

Tried going to cheap route by replacing with cap from hardware store...after buying and returning a couple of caps though, I threw in the towel and bought the correct part from GoWesty. It's sturdy as can be and beats the ill-fitting caps I found at ACE

It’s a cap…

…it keeps the water in. 👍

Drain Cap

Pretty expensive but it works great!

Fresh Water Tank Drain Cap

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Fresh Water Tank Drain Cap

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