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New R&S 241, OR-34OD: 4 1/8 Brand: Made In The USACulligan OR-34 B Size Not the A SizeOR-250 O-ring Everpure E-series and SR-X Systems Can be used: Ace Hardware-American Plumber-Ametek-Culligan-Master Plumber-Pentek and U.S. Filter and Everpure Housing EV311240 Omini 19125 Waterway 805-0241 O-RingHydrtech 34002028Sears, Kenmore 900375, STD302241, 42-34345 Housing O-ringAmerican Plumber 152030 O-Ring for W34-OR HousingAmerican Plumber WVC34 housingNorth Star WHFS Filter O-ring, 7337937 O-ring Material: FDA EPDM Durometer 70A Fits Pentek Standard and 3g HousingsPraher E-241, E241 O-Ring Lubricate With Clean Silicon Grease Made In USA Return Policy Replacement O-ring for the following water filter housings: All Pentek/American Plumber 3/4 inch I/O housings (except the WH34 model) HF-360 PVHCL-S1 HF-160Culligan HF-150A 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 152030, Pentek part number 151120, and also known as part number OR-34. This filter housing O-ring additionally fits housing model HF-360, PVHCL-S1, HF-160 and others. Complete Return Policy O-Ring problems: Send us your old O-Ring that worked and we will find you the proper O-Ring.