"Powerhorse water pump gives you the performance you need, when you need it. Engine not included. Uses long-lasting, high-end silicon carbide seals that are specially suited for heavy-duty applications such as pumping contaminated and abrasive fluid. Requires 5.5 HP engine w/ 5/8in.-18 externally threaded shaft, 2 7/16in.L and 3 5/8in. bolt circle. s. Shaft Length in. 2 7/16, Shaft Type Externally threaded, Seals Silicon carbide, GPH 11,820, Impellers Cast iron, Solid Handling in. 1 1/4, Volute Cast iron, Bolt Circle in. 3 5/8, Dimensions L x W x H in. 11 x 13 x 14, Max. Total Head ft. 82, Port Size in. 3, Required HP 5 1/2. Silicon carbide seals are 2 times harder, 15 tougher, and 50 stronger than common aluminum oxide seals FCD45 cast iron impeller and volute reduce vibration and last longer for semi-trash operations Uses standard NPT threads for attachment flexibility Utilizes a check valve to hold a prime while the pump is not running"