Adapter for the adaptation of different hose or pipe diameters. The adapters can also be used for our devices with the pressure connections for hose Da = 6 mm, Di = 4 mm (64 or 64POM) and Da = 8 mm, Di = 6 mm (86 or 86POM) if hoses with other dimensions are to be connected. The adapter is then screwed with the female thread (G1/8I for 64 or 64POM, M12x1 for 86 or 86POM) directly onto the thread of the screw connection on the device.