the Johnson Controls T-4000-119 is the standard Allen head adjustment tool required for the precise calibration and maintenance of T-4000 series pneumatic thermostats

Features high-grade nichrome heating elements for rapid heat-up and long-term durability in the airstream

including the GCS series

or differential pressure within a set point range of 0

System Longevity: Prevents long-term thermal stress on the blower motor and internal wiring by enforcing strict temperature limits

Trane VAL9478 TXV 320788-703 the Johnson Controls T-4000-119 isThe Trane VAL9478 is an OEM grade thermostatic expansion valve (TXV) engineered specifically for 4 ton cooling applications. Designed for high pressure R410A refrigerant, this component features a 3 8" ODF inlet and a 1 2" ODF outlet, ensuring low restriction sweat connections in residential and light commercial air conditioning systems. The 5 foot capillary tube provides the necessary reach for precise bulb placement on the suction line, allowing for