Pentek 151121 O-Ring for Pentek Slim Line, Standard Flat Cap and Counter Top Filter Housings
Images for Examples of Compatible Pentair Pentek Housings


Replacement O-ring for Ametek/Pentek  5", 10", and 20" filter housings in the Traditional Slim Line Series, Pentek 3G Slim Line Series, Pentek Counter Top Slim Line Series, and Standard Flat Cap Series Filter Housings.  The O-Ring is constructed of Buna-N FDA Grade rubber for added strength, elacticity, and reliability. Replacing the o-ring regularly can help ensure a leak-free water filter.
Pentek 151121 o-ring can be used in place of the Culligan Water OR-38.

Pentek 151121 O-Ring is the factory-original replacement for Pentek Filter Housings:

 

Pentek SlimLine Series Filter Housings 158132 158133 158138 158678 158114 158115 158116 158117 158120 158125 158126 158131 158841 158002 158003 158110 158111 158005 158006 158007 158008 158149 158098 158129 158842 158203 158196 158214 158215 158583 158765 158204 158204 158843  Note:  This O-Ring is not compatible with Ametek/Pentek Standard #10 and #20, 3G Standard, or Valve-in-Head (VIH) Series Housings, which use 151120.  151121 o-ring does fit Standard Flat Cap, but does not fit Slim Line Flat Cap, which uses a special o-ring.

Specifications for Pentek 151121     Pentek Part No: 151121 Alternate Part Numbers: OR-38 Material: Buna-N FDA Grade Size: 3⅝”  92mm  Outer Diameter     151121 is also Compatible With:     Culligan: OR-38 Hague: 200408 Nimbus: 100802 PURA: A58004, 34202027 RainSoft: 12994 Ametek/Pentek: 143026     Note:  This O-Ring is not compatible with Ametek/Pentek Standard #10 and #20, 3G Standard, or Valve-in-Head (VIH) Series Housings, which use 151120.  151121 o-ring does fit Standard Flat Cap, but does not fit Slim Line Flat Cap, which uses a special o-ring. Pentek 3G Slim Line Series Filter Housings 158598 158599 158601 158603 158604 158606 158637 158638 158639 158641 158602 158608 158610 158614 158616 158619 158642 158643 158644 158647 158620 158621 158622 158623 158625 158648 158649 158794