Sta-Rite Posi-Flo II Cartridge Filters PTM Series, Model PTM135, Separation Tank Assembly - Model 60SEP - O-Ring (a) WC93 Generic O-Ring Replacement O-239 Replaces Sta-Rite WC9-3, Hayward SPX4000T, Jacuzzi 13-0220-09-R 47-0448-05-R, and Swimquip 35505-1365