Ametek W34-OR O-Ring for Water Filter American Plumbing W34-OR O-rings 5 pack) American plumber W34-OR, 152030 filter o'ring replacement American plumber 3/4 inch i/O housings (except the Wh34 model) This filter housing O-ring additionally fits housing W34-OR hf-360, pvhcl-s1, hf-160 and others