Hayward SPX1580Z1 Housing O-Ring Replacement for Hayward Pumps and Filters Housing o-ring replacement Fits hayward abg, powerflo lx and powerflo ii pump models sp1580, sp1580x15, sw1585x20, sw1585x25, sp1540c, sp1750, 1775, 1780 Also fits hayward easyclear, pro and vl series above ground filter models c5501575xes, s166t1580s Weighs 10.7-Pound