If the O-ring is swollen or cracked it can cause your pump to suck air and spit air back into the pool through inlets and it must be replaced. Not replacing O-rings can damage your pool equipment, have a negative effect on filtration and decrease the efficiency of pool chemicals.
Fits the following Sta-Rite filters:PLM100 Cartridge Filters made before 3/97PLM150 Cartridge Filters made before 3/97PLD50 Modular DE Filters made before 3/97











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