G4030-DA-AL by Dixon Valve | Global Cam & Groove Reducer (Jump Size) Coupling | Type DA | 4" Coupler x 3" Adapter | A380 Permanent Mold AluminumConstruction: Nitrile Rubber seals. Made to Dixon specifications and branded Dixon. Safety Notes: Under no circumstances should cam and groove couplings be used for compressed air or steam service! Pressure rating is based on the seal of the mating part. Pressure rating recommendations are based on the use of mating Dixon fittings at ambient temperature 70F 21C with a standard seal installed. How It Works: To make a connection, simply slide the