To mount a water filled towel warmer on a central heating system you need some valve.
The angle valve set consists of an angle valve with either manual hand-wheel or a return thermostat + a limit / shut-off valve to the opposite side. The sets of angular valves are provided with pipe covers with rosettes with the same surface as the valves.
The straight valve sets consist of the same, but without covers.
The return thermostats measure the water temperature on the return side and then regulate the heat in the towel warmer.
Find more information under the different types of valves in addition.