The Humphrey 1/2 tubing QE4 large-sized quick exhaust valve is highly versatile. It redirects exhaust air to its high-flow 3/4 pipe exhaust port by sensing pressure differentials. It can function as a shuttle valve or achieve excellent check or flow control capabilities by adding plugs or orifices. The valve features a compact body with high flow capacity. The molded shuttle outperforms competitive plate-type designs.