Why is there only one inlet pipe and two outlets in the bathroom decoration now?

Normally, two pairs of wires are used for lighting, one pair is used for electric water heaters, and some of the two pairs of wires are used for exhaust and the like. The ground wires are usually shared, so there is no need to waste an extra wire.

The main switch of the building, when going to the socket and lighting in each room (including the kitchen or bathroom), is controlled separately and routed separately.

This pipe without a floor drain should be a dark drain, that is, a flush backfill leveling layer, in order to drain the stagnant water that seeps into the tile glue of the floor tiles.

In general, you asked this question. First of all you don't have pictures, just to say that. I don't know what structure your home is, it's best to go directly to a plumber, and they will go to your house to help you change it. >>>More

The goal of the heating deflation should be the deflation valve of the heating itself, which is generally given by the seller or manufacturer, and you can ask the one you bought.