000 BTU rating significant for sizing

Key Benefits: Broad Compatibility: Native support for TAC VB-7xxx series valves and discontinued legacy models from 1/2" to 1-1/4" sizes

this is the official manufacturer-designated direct replacement for C12-9018

If the internal ports or the connected condensate drain lines become blocked

While designed as a York HVAC part

Maxitrol MR251D-1 1/2 Regulator 320788-702 000 BTU rating significant forThe Maxitrol MR251D 1 1 2 regulator is a dual function modulator regulator valve engineered for critical indirect fired atmospheric burner applications. As a core component of the Selectra electronic gas modulation system, this 1 1 2" NPT unit eliminates the need for external motors or butterfly valves by providing precise, instantaneous temperature control through its internal plunger diaphragm assembly. Designed for high demand environments