In this video I use two slip couplings to tee into a rigid copper pipe. Slip couplings are useful for joining into any rigid copper pipe as they allow a new fitting or piece of pipe to be inserted into a pipe which cannot be moved. The fittings used in this video are solder ring fittings, which already have the solder built into them.
![](https://i.ytimg.com/vi/VQsOsND_Dnw/maxresdefault.jpg)