The third group of copper fittings is the compression. As its name indicates, this group copper fitting generally uses a mechanical pressure joint method. The copper thin band is shaped like a wedding ring and which, along with a threaded nut, fits over the copper pipe, the pipe is then inserted into the copper fitting, and the female thread on the nut is tightened down onto the male thread on the body of the fitting. As the nut is tightened, the thin band is crushed down onto the pipe and into concave seat inside the copper fitting, making a secure and watertight joint.
The final and newest group of copper fittings is called push fit fittings. Cleverly designed using internal grab rings, they are used in conjunction with technically advanced flexible plastic pipes supplied in either coils or lengths. Small metal or rigid plastic pipe stiffeners are inserted into the end bore of the pipe. The pipe is then inserted into the copper fitting until it reaches the integral stops inside the fitting, ensuring that the grab rings are located in the correct position. The joint then reaches its full strength when pressurized by the water flowing through it.
Regardless of which of the four groups the copper fittings belong to, they are always designed specially for different sizes in reference to the diameter of the copper pipe that the copper fittings are used to join.
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