The Pentek OR-241 is a genuine replacement O-ring designed specifically for Pentek Big Blue filter housings, including the 10" and 20" Big Blue models such as the 150071, 150072, 150081, and similar standard-capacity Pentek housings. It creates a reliable, watertight seal between the housing sump and cap to prevent leaks during filtration operation.

The Pentek OR-241 is manufactured from Buna-N (Nitrile) rubber, which is known for its excellent resistance to water, chlorinated water, and general filtration chemicals. This material ensures long-lasting elasticity and compression strength, providing a secure seal in cold water applications typical of Pentek Big Blue whole-house filtration systems.

Pentek recommends replacing the OR-241 O-ring every time you change your filter cartridge, or at minimum once a year. Regular replacement prevents leaks caused by compression set, drying, or cracking. Lubricating the new O-ring with food-grade silicone grease before installation extends its service life and ensures a proper seal in your Pentek Big Blue housing.

Yes, the OR-241 is a genuine Pentek (Pentair) OEM replacement part, ensuring exact dimensional fit and material compatibility with Pentek Big Blue housings. While O-rings themselves are not typically NSF-certified as standalone components, using the authentic Pentek OR-241 maintains the NSF/ANSI certification integrity of your complete Pentek Big Blue filter housing system.

To install the OR-241, first depressurize your filter system and remove the housing sump. Clean the O-ring groove thoroughly to remove debris or old lubricant. Apply a thin layer of food-grade silicone grease to the new OR-241 and seat it evenly into the groove. Hand-tighten the housing back onto the cap using the Pentek housing wrench—do not overtighten, as this can damage the O-ring and cause leaks.