The Interstate Pneumatics Straight Through couplers features an easy-connect design in which you simply push plug into coupler to connect. These couplers are interchangeable with the Straight Through Standard series couplers produced by other manufacturers. Precision machined bar stock construction provides resisitance to the effect of mechanical shock in rugged applications. These couplers have no valves. Smooth straight-thru bore allows maximum flow. Made from solid brass bar stock. Couplers have stainless steel springs and balls. Excellent for carpet cleaners, vacuum service and pressure washers. For pressure ratings use table below.