Adaptability:273241 piston rod assembly replacement either sand type or Diatomaceous earth type pool filters, replacement for pool and spa multiport valve push-pull slide backwash valve High-Quality Components: 273241 piston rod assembly includes a piston rod assembly, replacement O-ring (small)x2, replacement O-ring (large)x1, all made with high-quality, replacement part designed to optimal performance for your machinery Warm Service:273241 piston rod assembly specially equipped several replacement o in the product, to replace parts to provide backup options. O-ring are rubber material, which needs to be in a tight enclosure away from light Colour:Black&White Material:plastic Package Contents: 1 x 273241 Piston Rod Assembly 1 x big Gasket 2 x small Gasket 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.