the coupling of the eSafe series 320 is an easy to use high performance coupling with a long service life, it is a safety coupling that can be operated with one hand and releases the pressure before disconnection The male threads on the coupling and nipple are factory fitted with a thread seal, the couplings have a smaller external dimension than comparable designs, the fully automatic sequence simplifies operation, the eSafe design complies with ISO standard 4414 and EN 983