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This Filter O-Ring Replaces W34-OR is a replacement O-ring for all Pentek /American Plumber 3/4 inch I/O Filter Housings except the WH34 High Temperature Housing. This American Plumber O-ring is used in Standard 3/4 inch Housings and valve-in-head housings. This standard O-ring is known as the American Plumber part 152030and also known as part number OR-34. This filter housing O-ring additionally fits housing model HF-360, PVHCL-S1, HF-160 and others. American Plumber 3/4 inch I/O housings (except the WH34 model) HF-360 PVHCL-S1 HF-160