Every Geka-fitting consists of two coupling pieces, which can be used in any combination.
This Geka-coupling with 1/2 inch (18.7 mm) female thread is often used with water taps, that have a 1/2 inch male thread, also with t-pieces, elbow fittings, etc with 1/2 inch male thread.
If you want to make the connection capable for fuel or plant oil, you have to replace the black standard rubber seal with a viton seal (geka-viton).
