Hayward versatile large capacity automatic wide track Auto-Skim skimmers with main drain and fittings. Features a variety of plumbing configurations in addition to color on cover style options. They also include a 3/4-inch auxiliary knockout port that can be use as a pool overflow or water fill line. The bodies are molded out of durable ABS plastic. Comes with standard square cover to accommodate commercial requirements. Stackable notched extension collar allows infinite vertical adjustment. Optional float/by-pass valve. Measures 1-1/2-inch pipe size and 9-1/4-inch throat length.