two-pipe thermostats regulate their own supply air and do not require an external inline restrictor

Inspect the tip for significant erosion or carbon buildup

Fail-Safe Operation: The spring-return mechanism ensures the damper reverts to a default position during power interruptions

This specific model (BGA) does not include internal auxiliary switches

By housing the delicate quartz fiber bundle

Resideo 45900446-052/B Venturi 323055-751 two-pipe thermostats regulate their ownProperly calibrate your gas control systems with the Resideo 45900446 052 B Venturi, a precision engineered manifold component designed to interface specifically with Honeywell VK41 and VK81 series gas valves. Built from high grade thermoplastic to withstand the rigors of industrial ventilation and gas distribution, this replacement venturi maintains consistent fluid dynamics and pressure differentials critical for high efficiency combustion.