A 5 port, 2 position sub-base mounted vavle that supplies full line pressure to port 4 and reduced pressure (30 psig/2 bar) to port 2. This provides full cylinder force to move the load, but returns the cylinder with less pressure thus reducing your compressed air consumption by up to 30%. Although reduced, the pressure in port 2 provides quick return of the cylinder. Replaces any brand ISO 5599/I valves without adaptation. Spool & sleeve construction for long life. Leakage in cylinder & fittings reduced due to low applied pressure.