"This Sludge Master Air-Powered Self-Priming Submersible Trash Water Pump can handle mud, leaves, twigs, sand, sludge and solids up to 1 1/2in. and is self-draining to prevent damage in cold weather. Designed to handle rough treatment and can run dry without damage. The two-vane cast-iron impeller operates at low RPM with less wear. U.S.A. Pump Housing Aluminum, Self-Priming Yes, Dimensions L x W x H in. 23 1/2 x 13 x 13, Seals Face-type mechanical, Volute Aluminum, Discharge Port in. 3, Max. Total Head ft. 55, Impeller Shaft 416 SST, Max. PSI 80, Suction Type Steel strainer, Flow GPH 18,000, Solid Handling in. 1 1/2, HP 2 1/2. 80 CFM max. air consumption Requires 1/2in. dia. air hose Fits into a 14in. opening Continuous automatic lubricating oiler"