John Guest Speedfit Brass Coupler 15mm X 1/2" Male BSP (Pack Of 10)JG Speedfit brass male coupler for connecting metric pipe using a male thread. To connect the push fit end, simply push onto a plastic or copper pipe. To demount the connection, push the collet towards the body of the push fit fitting and pull the pipe to release. The JG Speedfit brass male coupler is quicker and easier to install in confined spaces than traditional methods as it eliminates the need for hot works. Designed, manufactured and assembled