DZR straight compression couplings have been produced when casting with high levels of anti corrosion zinc, which is called dezincification. This is a process that stops corrosion when in contact with specific chemicals. These are available in 15 - 22mm copper tube sizes. These have been designed to be most suitable for high pressure glycol fluids. DZR CxC couplings sized in 15-22mm are ideal for glycol fluid compliant systems. We offer 15mm and 22mm brass tube inserts are available for superior leak free sealing.