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3/8 In. Brass Air Valves 4-F 3-Position 200psi 10mm Orifice 40watt coil 200psi 4-Cyl - 3/8 In. all fittings harness slowdown & Speed control valves. This Fitting and Wiring Harness includes a check valve that goes between the tank and the valves which prevents air from flowing back from your bags through the valves when a demand for air is put on your tank.