Features: Easy to Install Strong and durable Easy to tighten the knob Including: Tension Clamp, Spring, Nut Suitable for medium to small-sized swimming pools, designed to handle up to 30,000 gallons of water Compatible with Hayward EC50AC perflex D.E. filters Hayward EC50C80X5S perflex D.E. filters Hayward EC50C90 perflex D.E. filters It will NOT fit Hayward Micro-Clear DE filter or Hayward Super Star Clear cartridge filters