Bathroom plumbing with pex
When plumbing with pex or copper, bathrooms are plumbed usually for a sink, a bath/shower, and a toilet. The waterlines will need to be routed so that they branch off of the main lines and into the walls where each fixture will be located with copper. If using pex then each fixture has it's own designated water line.
This is a shower/tub assembly with a mixer in the middle that regulates water temperature and has an anti-scald valve. This particular assembly will only be used for a shower. As you can see, the tub pipe is capped off.
The hot line goes in one side and the cold line goes in the other. After the water goes through the mixer for temperature control, it runs up to the shower head.
The drawing above shows how the shower/bath assembly works. You can buy these components at plumbing stores as one piece or you can just put it together yourself.
Notice how these Pex hot and cold lines are installed right onto the fixture intake faucet. This shows how easy it is to work with Pex tubing because of the flexibility. The Pex tubing just screws onto the faucet.
Some larger baths have faucets called "filler faucets". These require bigger water lines. In this case a special manifold with a larger outlet would be needed. Most water outlets would be 1/2-inch, but there would be a hot and a cold outlet that would be 3/4-inch. This would require 3/4 tubing to the fixture.
There are other fixtures that are a little bit difficult for the Pex to bend sufficiently to reach the intake. A toilet is a good example of this. In this case we use compression tubing which is completely flexible. It's also a code regulation in many areas to use compression tubing on toilets with its own shutoff valve.
The picture above shows how to connect the faucets inlets. The fittings screw onto the pipe nipple making it easier because it is a flexible tube. Copper and galvanized pipe nipple fittings have specially threaded ends for termination fittings to screw onto and for branching off the mainline.
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