Fits for Hayward Power-Flo LX Flooded Suction Pumps Models:SP1575LX, SP1580, SP1580X15, SP1520UN, EP1500LX, SP1680, SP1540TLFits Hayward Power-Flo II Self-Priming Pumps Models:SP1705, SP1710, SP1711, SP1720, SP1725, SP1750, SP1775, SP1780SPX1500P Pool Pump Lid Strainer O-Ring suitable for Hayward Powerflo 1500 1580 1700 SeriesSPX1500P Pool Pump Lid Strainer O-Ring for Hayward Powerflo 1500 1580 1700 SeriesSPX1500P O-Ring Replacement for Hayward Power-Flo, Power-Flo II, Power-Flo Lx Pool and Spa Strainer Cover PartSize: Approximately 5-1/8" ID x5-1/2" OD x 3/16" ThicknessReplacing the O-ring can return your swimming pool’s system back to peak performance and efficiency.Made from heavy duty premium materials for durability and performance.leaking O-ring gasket needs to be cleaned and replaced to keep the pool chlorinator sealed and prevent pressure leakage.Please Refer To Your Owner'S Manual To Ensure You Are Ordering The Correct Part.