> The P-trap is a pretty standard RV part.  You can usually buy a "kit" from
> an RV shop that has the trap, drain cup & strainer, and a hose for about
> $20

Yup. I sell it too. Part number 253 069 183A, $19.95;  including the p-trap,
hose, drain cap, and floor fitting.  I list this as fitting approx. '86-91,
as the earlier Westies were a bit different. It's been a while since I had
an early 80's model so I can't recall the exact difference.  I would think
that you could easily fit this to an earlier one, too, though, since the
sink is the same, although I cannot say that I've tried it myself.

- Ron Salmon
  The Bus Depot, Inc.
  (215) 234-VWVW
  www.busdepot.com

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