Resideo 391937 Conversion Kit

The Resideo 391937 Conversion Kit is a professional-grade solution for field-converting gas valves from Natural Gas to LP (liquid propane). Engineered for technicians servicing V400, V800, VS820, and VS821 Series combination gas controls, this kit provides a precise 8" to 12" W.C. adjustment range. This part is functionally identical to the 391937/U and is designed exclusively for standard and slow opening valves; it is not compatible with step opening models. Each kit includes a high-tolerance tapered regulator spring, o-ring, screw, and cap to ensure a leak-free seal and stable manifold pressure. By utilizing this Resideo LP conversion kit, contractors can maintain the performance of Honeywell gas valves while adapting to local fuel requirements. Proper installation requires a manometer to verify that gas pressure settings align with the appliance manufacturer’s requirements for safe operation.

• Universal Compatibility: Specifically designed for V800, VS820, VS821, and V400 Series standard and slow-opening gas valves.
• Precise Pressure Regulation: Features an adjustable LP regulator spring capable of 8" to 12" water column settings for accurate fuel delivery.
• Complete Field Kit: Includes the 391937 component hardware—spring, o-ring, screw, and cap—required for a professional NAT to LP conversion.
• OEM Performance: Restores factory-spec gas modulation and bypass functions on single-stage systems without replacing the entire valve.

Is the 391937 compatible with step opening valves?
No, this kit is strictly for standard and slow opening gas valves. Attempting to use this on a step opening valve will result in improper combustion and unsafe operating conditions.

What is the difference between 391937 and 391937/U?
There is no functional difference. The 391937 and 391937/U are the same Honeywell/Resideo conversion kit; the "U" designation typically refers to universal retail packaging.

Does this kit work for translating LP back to Natural Gas?
No, this is a dedicated Natural Gas to LP gas conversion. To return a valve to Natural Gas, a different spring kit (typically 391936) is required to meet the lower pressure requirements of NAT gas.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.