The Watts 0383310 (Model 740-1 1/4-50) is a high-capacity ASME Section IV heating boiler safety relief valve designed for overpressure protection in large-scale commercial and industrial hydronic heating systems

OEM Compatibility: Designed for direct drop-in replacement on Lennox 5HP HVAC motors

the bellows are rated for a maximum overpressure of 475 psi

leading to a catastrophic short that may also take out the noise filter board

For contractors servicing Laars Pennant or Rheos series units

Browning 3L450 Belt 328140-751 The Watts 0383310 (Model 740-1The Browning 3L450 is a high performance Fractional Horsepower (FHP) V Belt designed for light duty HVACR applications and industrial machinery. Featuring a 45 inch outside circumference and a 3 8 inch top width, this wrapped belt is engineered with a proprietary cover fabric that provides superior grip and abrasion resistance. The internal tension members are thermally bonded to eliminate cord separation, ensuring consistent power transmission in