Resideo T3019W0NA Sensor 318973-401 the 79L66 is built to

the 79L66 is built to withstand high operating pressures up to 135 PSI

330 BTU/H depending on operating conditions

Efficient Performance: Optimized 1

Universal parts often lack the precise dimensions required for proper gas flow

Resideo T3019W0NA Sensor 318973-401 the 79L66 is built toThe Resideo T3019W0NA, or Thera 6, is a high performance direct mount thermostatic radiator valve head designed for precise hydronic control. Engineered as a self actuating controller, this unit features a premium German made, liquid filled internal sensor that ensures rapid response times and minimal hysteresis. Ideal for V100 and V2000 radiator valves, it utilizes a standard M30 x 1. 5 connection to regulate hot water flow based on ambient air