Figure 5-25.Bathtub combination waste and overflow.
The wastewater supply lines, as shown in figure
5-26, are then connected to the tub.
The faucet and shower combination for a bathtub
and shower is connected to the hot and cold waterlines
that were installed when the piping was roughed-in.
The manufacturers specifications should be used to
determine the height of the riser. The height, however,
may be specified by the user. The shower and bathtub
piping and fittings installed within the wall are made of
rough brass; those that extend through the finished
wall have a chrome finish. A typical bathtub and
shower piping arrangement is shown in figure 5-27.
When you make this type of bathtub and shower
installation, be sure to locate the bathtub spout from 2
to 4 inches above the rim of the tub. Spacing the spout
above the rim of the tub prevents siphoning of the
water from the tub in case the valve is left open and the
water drops at the same time. This installation prevents
cross-connection between potable and nonpotable
The mixing valves in the shower system supply a
uniform temperature of water for the shower or tub.
The temperature of the water may be regulated
between the limits of the temperature of the cold-water
supply and the hot-water supply. The equipment used
to control the temperature of the water are the manual,
the pressure, and the thermostatic mixing valves.
The manually controlled mixing valves consist of
two hand-operated valves in one body with an outlet
for both valves that feed the shower head. The valves
are turned by hand to control the temperature of the
water. Manually controlled valves require a piping
arrangement similar to the one shown in figure 5-28.
This water tempering setup does not protect against
Figure 5-26.Tub waste hookup.