HBX Control Systems has been an industry leader for complete control solutions for radiant floor and baseboard heating systems, multi-stage boiler applications, automatic snow melting systems, and Geothermal and Solar Thermal. This innovation could just be the next hero for your water and snow monitoring needs.The HBX REL-4000 is a genuine 4PDT relay socket replacement. Relay sockets accept electromechanical switches in which the variation of current in one electric circuit controls the flow of electricity in another circuit. The HBX REL-4000 comes with a Limited warranty to ease you from future worries from defects in workmanship and materials under normal use and service for a period of one year.Over 15 years, HBX Control Systems ensures all end-users sleep comfortable at night through a relentless commitment to proven innovation and ease of control products. Go get yours at PlumbersStock!