GMP Self Priming Electric Drive Gear Pumps, 300GM-GE03, 600GM-GE09, 1000GM-GE15, 1500GM-GE21, 2000GM-GE21, 3000GM-GE33, 3600GM-GE39, 300GT-GE04, 600GT-GE10, 1000GE-GE16, 1500GT-GE22, 2000GT-GE28, 3000GT-GE34, 3600GT-GE40 Pumps. Volumetric self priming gear pumps with built in bypass valve. Performances will vary depending on media being pumped. Suitable for pumping viscous liquids without suspended particles - hydraulic oil, vegetable oil, diesel fuel oil, varnishes and foodstuffs are examples. Not suitable for liquids that have water within them.