This is a single diaphragm adjustable pressure regulator. it is one of the highest quality regulators ever manufactured and has been used as OEM equipment by Rolls Royce and other fine automobile manufactures. It can be used on all single throttle body fuel injected engines. Effective fuel pressure range of this regulator is from 14 PS.1 to over 60 PS.L. It's most effective when used on high vacuum (single throttle body) applications. This model is supplied with 7mm barbed fittings. It adjusts with a top mounted screw and locked with a chrome cap nut.