(under subclass 59) Apparatus which closes the system to liquid flow and opens a waste outlet so that at least part of the liquid in the system is drained or wasted in response to the sensing of low temperature or freezing conditions.
SEE OR SEARCH THIS CLASS, SUBCLASS:
107, for opening fluid waste passage in response to stopping of the main flow.
596+, for stop and waste devices not responsive to change in condition, and see the search notes thereto.
