The Pentair 263064 Push-Pull or Slide Backwash Valve is designed to work with Pentair DE and Sand pool and spa filters. This valve replaces the Pentair 261165 backwash valve and works with Triton side mount sand filters and FNS, FNS Plus, Nautilus and Nautilus Plus side mount DE filters. The 263064 slide valve is designed for maximum working pressures and performance and includes a 1 year manufacturer's limited warranty.