Graco 184158 NUT, SHOVEL 1300 psi Air Inlet Size (in) 1 4 Tip:163716 6 Air Inlet Size (in) 1 4 Air Inlet Thread Gender Female Air Inlet Thread Type NPT Component A Inlet Size (in) 3 8 Component B Inlet Size (in) 1 5 16 Component B Thread Gender Male Component B Thread Type UN 2A Fluid Inlet Size (in) 3 4 Fluid Inlet Thread Gender Male Fluid Inlet Thread Type NPT Fluid Outlet Size (in) 3 4 Fluid Outlet Thread Gender Female Fluid Outlet Thread Type NPT Hose Length (ft) 25 Hose Length (m) 7 50 feet of steel reinforced high pressure hose It is listed as Ref This Graco replacement part (SKU 184158) is a priming piston nut made of alloy steel