Brasshards Copper Capillary Couplings provide a permanent solution for straight jointing of copper pipe. Constructed from the finest copper, they are safe for use in the supply of water and are perfect for many other residential and industrial applications. Copper provides excellent thermal conductivity and has been proven against the test of time by being able to withstand high temperatures while being resistant to corrosion. All Brasshards fittings have WaterMark approval and fully compliant with AS3688.