This spring is designed to use with Hayward Multiport Valves models SP0710, SP0710X, SP0711, SP0712 1-1/2-inch, SP0715, SP0716 2-inch, SP0704, 1-1/2-inch and SP0740DE 2-inch and also compatible Hayward Multiport Valve Kit Mount and Sand Filter, Multiport Valve models HCV20715, SP071620T, SP0710XALL, S220T2. Weighs 6.2-Pound.