The Einhell quick coupling is a connection piece made of solid brass for use with compressed air hoses. The quick coupling features a 1/4 inch internal thread. Quick couplings are integrated into the compressor housing and are used when assembling a compressed air hose that needs to be customized. Accessories for building compressed air systems, including hoses suitable for compressor applications, fittings, clamps, and more, are available as Einhell accessories for compressors.