Adapter GS 2 1/2 inch external thread to Camlock coupling DN 50 with slide valve. For connecting the gas test stand pipe to the main pipe. Camlock coupling on the outlet side for connecting the gas hoses, 2 1/2 inch external thread on the inlet side for connection to the pipeline. The gas flow can be continuously regulated via the socket shut-off valve. For pressure and/or concentration measurement 1x screw coupling 1620 and 1x coupling series 21 are available.