The SMC S Coupler with Threaded Model from KK series employs a unique connection method. A slim body design and large effective area are achieved with a construction that does not use steel balls or valve springs and therefore does not restrict the flow path. Together with a reduction of the body size, pressing parts and resin parts are used to achieve an overall weight reduction. General purpose type With sleeve lock mechanism Low leakage seal construction Light weight No spring located in the flow path