50-inch bore size (hub diameter)

It is designed to be threaded into existing 3/4" NPT ports on the boiler or remote sensor manifold

Enhanced Connectivity: 4-plug configuration provides reliable electrical transmission for power and internal protection circuits

Compatible with a wide range of Lennox

The 193810 features a 1/4" barbed connection and a normally open contact configuration that closes upon sensing the correct static pressure

Watts 0121430 Valve 326058-758 50-inch bore size (hub diameter)The Watts 0121430, also identified as the LFLLL40XL 150, is a high capacity automatic reseating temperature and pressure relief valve designed specifically for commercial and large residential hot water supply tanks. Featuring a 3 4 inch NPT male inlet and female outlet, this lead free T&P valve is engineered for systems requiring a high ASME steam relief rating of up to 1,437,000 BTU hr at 150 psi. The extended shank design, measuring 3 21 32 inches,