For $29 you can get a better replacement unit from Camping World.  It is
different from stock, and requires fabrication of a larger washer since it
requires a smaller opening for mounting.  Also, it has no provision for a
"city water" hookup, so if you have to have that, you need to rig up
something with a "T" fitting and a check valve.

Seems like a lot of work for only a $15 savings over the correct OE
replacement.

- Ron Salmon
  The Bus Depot, Inc.
  http://www.busdepot.com