Item description from the seller CF 3030 G: 3000 psi @ 3.1 US gpm, 3/4-in Shaft Pressure Washer Pump The CF 3030 G is one of our prosumer pumps. Compatible with ¾″ horizontal shafts, this triplex pump makes for a sweet upgrade over axial pumps compatible with the same shaft size. Apart from the superior triplex design, a detachable unloader valve makes replacements and upgrades a cinch. .