Product Features:Heavy-duty construction - base and guide arm made of heavy-gauge steel stampings with reinforcing ribsCorrosion resistant - Individually powder-coated steel componentsEasy mounting - base slots to facilitate mounting and adjustmentPower spring - retraction spring with substantial output torque and long service lifeMaximum air flow - 35 cfm1/2 NPTF (m) Connecting Hose Inlet & Delivery Hose Outlet