Replacing a sticking or restricted expansion valve with this factory-authorized part restores the precise refrigerant flow control required for professional-grade HVAC service and long-term equipment reliability

The standard sample line connectors are designed to accept 3/16" I

Which controllers work with this probe

Key Benefits Precise Signal Transmission: Ensures the pressure switch accurately detects the vacuum or pressure required to engage the burner

providing a 100% shut-off safety lockout if ignition is not established

Siemens Combustion VGD20.403U Valve 320788-704 Replacing a sticking or restrictedThe Siemens VGD20. 403U is a high performance 1 1 2" NPT double gas valve designed for integration with SKP series primary actuators. Engineered for commercial and industrial combustion system safety, this double block gas valve body features a high flow design to minimize pressure drop while maintaining a compact footprint. It is suitable for natural gas, propane, and air applications, providing a reliable shut off mechanism when paired with electro