Both halves of the coupling are of an identical design with no separate male or female halves. Either half can, therefore, be connected to any similar size of coupling.
The hose coupling can be connected to another style, eg. Hose tail, female or male threaded and blanking caps. It is essential that the distance between locking ears (KA) is the same on all fittings.

any adapter (male) may be coupled with any coupler (female) of the same size. this provides maximum flexibility in setting up the most convenient and efficient quick coupling system needed for the job.
adaptors and couplers are available with either male or female bsp thread or hose shank connections.
each part carries a letter prefix which designates whether it is an adaptor or a coupler and whether it is threaded male or female or hose shank. the letter systems are standard in the Industry and facilitates proper identification come the basic parts available.