The R-614 multi check valve integrates four check valves in one compact valve body. Features include easy manifold-mounted design, integrated circuitry, Octoport outlet design, and maximized performance. Eight air passages extend longitudinally through the body, surrounding the valve cavity integrated circuit. The R-337 is a 3-way, spring return, fully ported, piloted valve with an independent check valve in the same body. The RS-338 is a 2-position, 3-way, double-piloted, fully ported valve also with an independent check valve.