Compatible to Pentek Water 151121 (6 pack) Direct replacement for the following part numbers: Pentek 151121; American Plumber W38-OR , 152031; Ametek 151121; Campbell 10800-034; Culligan OR-38 Compatible with the following water filter models: Pentek #5 and #10 Slim Line Housings, Pentek 3/8" Inlet/Outlet Slim Line Housings with a 3.5" diameter housing sump, Pentek 3G Housings; Ace Hardware 45335, 45449, 48166, 49562, 4001699, 4158515; American Plumber WLCS-500, WRO-3167; Ametek Kleen-Plus / Pentek CSL-CIK, CCF-201, CTR-CMR-10, PSCL-C2, US-560, US-560K, SY-5167, SY-5197; Culligan RVF-10, US-316, US-550; US Filter RO-2127, RO-2300, RO-2300-A, RO-3167 Material: Buna-N (nitrile butadiene rubber) Additional Details ------------------------------ Bullet point: DURABLE BUNA-N CONSTRUCTION: This water filter o-ring features robust Buna-N rubber gasket material engineered for rigorous daily use in whole-house water filter systems. The durable flat gasket resists compression, cracking, and chemical degradation, ensuring years of reliable performance. Unlike generic rings that deteriorate quickly, this OEM-quality seal maintains flexibility through countless filter changes, protecting your home water filter investment with dependable leak-free service. Product description: The IPW Industries Watts Flow-Max FM20041-B O-Ring is an essential replacement component for maintaining your whole house water filter system. Crafted from durable Buna-N rubber gasket material, this flat gasket o-ring is specifically engineered to provide a secure, leak-proof seal for FPentek 151121 filter housing models. Direct replacement for the following part numbers: Pentek 151121; American Plumber W38-OR 152031; Ametek 151121; Campbell 10800-034; Culligan OR-38. Compatible with the following water filter models: Pentek #5 and #10 Slim Line Housings, Pentek 3/8" Inlet/Outlet Slim Line Housings with a 3.5" diameter housing sump Pentek 3G Housings; Ace Hardware 45335 45449 48166 49562 4001699 4158515; American Plumber WLCS-500 WRO-3167; Ametek Kleen-Plus / Pentek CSL-CIK CCF-201 CTR-CMR-10 PSCL-C2 US-560 US-560K SY-5167 SY-5197; Culligan RVF-10 US-316 US-550; US Filter RO-2127 RO-2300 RO-2300-A RO-3167. This water filter o ring withstands the rigors of daily use, resisting compression, cracking, and chemical degradation from chlorinated water. Its precise dimensions ensure a best fit, eliminating common issues found with generic rubber o rings such as water bypass or pressure loss. The robust construction maintains flexibility through countless filter changes, protecting your home from costly water damage. Installation is simple and hassle-free - the flexible rubber gasket slides smoothly into the housing groove without special tools, creating an immediate water seal. Whether you're performing routine sediment filter maintenance or replacing a worn gasket, this o-ring delivers seamless performance. As an essential spare part for your water filtration system, this OEM-quality component ensures optimal system performance, maintaining proper water pressure and flow rate. Smart homeowners keep this affordable replacement on hand for routine maintenance or emergency repairs, ensuring uninterrupted access to clean, filtered water.