Contractors utilize this Robertshaw 5300 series thermostat for its reliable snap-action switching

Step-Down Configuration: Features a specific 5/8" x 1/2" connection size to match original equipment liquid line specifications without the need for additional adapters

and combustion fuel gas shutoff systems

this Conbraco gauge cock is the industry standard for contractors requiring dependable boiler water level monitoring

This is a normally open globe valve

McDonnell & Miller 334100 Float and Gasket Refrigerant Contractors utilize this Robertshaw 5300The McDonnell & Miller 334100, identified by model number 421 30, is a specialized float and gasket kit engineered for Series 25A make up water feeders (including 25 A and 25 AB) and Series 27 W liquid level controls. Designed for high performance fluid management in commercial and industrial hydronic systems, this kit facilitates the precise mechanical monitoring required to prevent dry fire conditions or overflow. The assembly includes a replacement