Kingston Model 298 Air Control Valve is a “two step” valve designed for operating single acting cylinders such as those found on lifting devices. It features durable brass construction with Buna-N seals. Inlet stem is designed to provide restricted flow on initial opening with full flow achieved when fully open. Model 298 has a vertical bottom cylinder port and has a maximum operating pressure of 150 psi. It has a “two step” valve design for operating single acting cylinders. Kingston Model 298 differs from the 296 only in the Tank Valve, the Tank Valve is only present is the 296.