Pentair PacFab 2" PVC Slide Valve O-ring Kit Pentair PacFab 2" PVC Slide Valve O-ring Kit You Get: (2) Piston Seal O-rings, (1) Small O-ring, (1) Valve O-ring Quality Professor Foam replacement kit! OEM quality at a fraction of the OEM price! Quality Aftermarket parts from Professor Foam!