24 PLUMBING SYSTEMS AND THERMOSTATIC CONTROLS THEREFOR FOR USE IN SELF-SERVICE LAUNDRIES, SAID PLUMBING SYSTEMS INCLUDING THE FOLLOWING COMPONENTS: CONDUIT; WATER HEATING AND STORAGE EQUIPMENT; TEMPERATURE GAUGES; ELECTRICAL COMPONENTS, SUCH AS SWITCHES, WIRING AND CONNECTORS; CIRCULATING PUMPS; AND GATE AND CHECK VALVES