This Hypro diaphragm pump works great for heavy-duty and high pressure use. It performs up to 37.8 GPM with a 725 PSI maximum. Featuring bronze external manifolds and brass heads, this diaphragm pump works wonderfully for chemical spraying situations that require more length to the spray or high pressure disinfecting. Maintenance is a breeze with the external manifold design and thanks to the strong industrial construction. The pump has a 1-1/2" HB inlet, _" outlet and 1-3/8" six splined male double-ended shaft.