Air Line Connection Kits Kit includes Piggyback Filter / Regulator with gauge, pipe nipple and a 5-foot section of hose Air Motor Mufflers Reduces noise level that ARO pumps produce during operation ARO-Stop® Valves Shuts off pump when excessive cycling occurs. Needle Valves Controls air volume supplied to pump, thus permitting operator to control speed of pump. Piggyback Filter-Regulators Efficiently remove solid particles from compressed air lines Threaded Exhaust Kit Kit allows operator to pipe exhaust air away from application