this Type S coupler flange features a 1-1/4 inch finished bore with a standard 1/4" x 1/8" keyway

The Robertshaw 4350-128 is a professional-grade BJ Kit for Griddle systems

it provides high drying capacity while maintaining a low pressure drop

Durable Construction: Engineered to withstand the acidic nature of furnace condensate and the thermal cycles of high-efficiency gas heating

as this 43800013 model is the standardized design for ECR International boiler systems

Maxitrol MR212D-1010 Valve Refrigerant this Type S coupler flangeFor veteran HVAC contractors managing direct fired burner systems, the Maxitrol MR212D 1010 is the specific 1 1 4" NPT modulating gas valve designed for negative pressure applications. Engineered to handle a maximum inlet pressure of 5 PSI, this component functions as both a modulator and a high performance gas pressure regulator, eliminating the need for a separate upstream regulator in most configurations. It is identical to the MR212D 1 1 4,