[Model: geka-3-4i]

Every Geka-fitting consists of two coupling pieces, which can be used in any combination.

This Geka-coupling with 3/4 inch (26.44 mm) female thread is often used with water taps, that have a 3/4 inch male thread, also with t-pieces, elbow fittings, etc with 3/4 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).