Hayward Skim Master skimmer with float valve. Features durable ABS unibody construction. Designed to use for in ground, concrete and gunite, residential or commercial pools. It is a non corrosive large capacity automatic surface skimmer has self adjusting 8-inch weir. Also has dual outlets and threaded internal connections for pressure testing. No glue is used in manufacturing, promoting maximum strength and longevity. It include 3/4-inch auxiliary knockout port that can be use as a pool overflow or water fill line. It meets specific NSF commercial requirement. Comes with 4-1/2-inch throat length. Pipe measures 1-1/2-inch FIP threaded end connection.