The Unitor couplers are time tested and proven to out-perform in all applications and to be totally leakage free. They are the result of many years of development aimed in one direction: an uncompromising standard of quality and flow performance in each and every application.
The plug and socket fitting portion of couplings 20,30 and 40 are interchangeable, as are those of the 400, 600 and 800 couplings. This means that a coupling 20 may be connected to a 30 or 40, the only difference being the flow capacity of the couplings.