Kidde Airsense Stratos 27mm Socket 3/4 Female to 25mm Female Red ABS socket for connection 3/4 and 25mm pipework together. The socket allows sections of pipework to be easily disconnected for maintenance. Aspirating smoke detection system is the network of sampling pipes that actively transport air from a protected area to the detector. ABS (Acrylonitrile Butadiene Styrene) is a homogenous material with good chemical resistance and high impact strength. Other beneficial features are its suitability for use at low temperatures (-40C) and its ease of jointing.