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Pentair 151122 O-Ring for Big Blue Filter Housing
Replacement O-Ring for 1/4", 3/8" and 1/2" Inlet Slimline and Standard Filter Housings. The O-Ring is made of Nitrile Rubber or Buna-N rubber for added strength and elasticity to create create a tighter seal. The O-Ring creates a watertight seal in the housing and must be replaced if damaged.