the 3F05-1 is the official direct replacement for the legacy 3F05-3 model

often providing improved service life due to the higher dielectric strength

It serves as a direct cross-reference for the Auburn I-31

To ensure proper operation and prevent debris from settling

As a differential pressure switch

Schneider Electric (Erie) VT3212G13B020 Valve Assembly Els PW 17895 the 3F05-1 is the officialThe Schneider Electric Erie VT3212G13B020 is a heavy duty Three Way PopTop Zone Valve Assembly engineered for high performance hydronic control in commercial and residential HVAC systems. Designed with a 1 2" sweat connection and a 3. 0 Cv flow coefficient, this two position zone valve provides precise water regulation for fan coils, baseboards, and air handlers. The assembly features a high torque 120Vac spring return actuator (AG13B020) that ensures