Backwashing Filters (with Fleck Valve) - Automatic Backwashing Filters. 1.5 cu. ft. Includes by-pass valve with fill port. Media sold separately. Backwashing Filter Systems. Include: Fleck 5600 valve. Control Valve Cover. Simplex tank and connection system. Generously ported bypass valve. Installation operation & trouble shooting video included. 1 in. connection NPT. When ordering these models be sure to order 2 each boxes of media.