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=== Quick Connect 1/2" CTS Coupler ===[[File:120x120_12QuickConnect.jpg|none]]Quick-Connect connectors are becoming increasingly more popular in pluming installations with hybrid pipe types. Pictured is a 1/2" CTS to 1/2" CTS quick connect coupler. CTS stands for Copper Tube Size. With this connector you can join connections to PEX (plastic) CPVC, and copper tubing. They seem to be reliable and are certainly very easy to install. Inside the connecter are rubber seals, plastic and sometimes metal pieces. Like a Chinese finger trap, you can insert the pipe in, but it locks so you cannot pull it back out (without excessive force.) The CPVC, PEX, or copper pipe is inserted all the way, and a water tight seal is created. Water pressure just aids in the locking action and seal. When used with copper, ensure that the copper is clean and smooth, with no corrosion. If pressed onto copper with corrosion present, there will likely be leakage. It is recommended that you cut the copper tubing, clean it, and mark it just as you would with preparing for any other method of fitting connection. However instead of having to solder, you can simply push the fitting onto the copper until it reaches your mark and snaps tight.