"This rugged air-powered submersible trash 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. Self-Priming Yes, Pump Housing Aluminum, Dimensions L x W x H in. 23 1/2 x 13 x 13, Volute Aluminum, Discharge Port in. 3, Max. Total Head ft. 55, Seals Face-type mechanical, HP 2 1/2, Impeller Shaft 416 SST, Max. PSI 80, Flow GPH 18,000, Solid Handling in. 1 1/2, Suction Type Steel strainer. 80 CFM max. air consumption Requires 1/2in. dia. air hose Fits into a 14in. opening Continuous automatic lubricating oiler"