Finding a reliable gas regulator for a generator is essential to maintain steady fuel pressure and avoid interruptions during operation. This article highlights five regulators that are commonly used with generators and LP or NG fuel sources. Each product is evaluated for compatibility, pressure range, durability, and ease of installation. Whether you run a home backup generator or a portable system, the right regulator helps ensure safe, consistent performance under varying load conditions.
| Product | Brand | Fuel Type | Regulator Type |
|---|---|---|---|
| Marshall 1642-DFF Generator Propane LP Regulator | MEGR-1642-DFF | Propane LP | Two-stage, adjustable |
| Maxitrol 325-5AL-66 | MAXITROL | Propane/Natural Gas | Single stage |
| JDLLONG 039-122 Low Pressure Regulator | JDLLONG | Propane/Natural Gas | Low pressure regulator |
| Flame King G2R150B-POLa | Flame King | Propane | Two-stage, POL inlet |
| CALPOSE 12FT 2 Stage Propane Regulator | CALPOSE | Propane | Two-stage |
Marshall 1642-DFF Generator Propane LP Regulator
The Marshall 1642-DFF is a propane LP regulator designed for generator applications with a 11″ Water Column output and a 3/4″ female NPT input plus 3/4″ side output. It requires a 10 PSI input from a first-stage regulator and offers adjustable output in the 9″ to 13″ Water Column range. This two-stage setup supports consistent gas flow, helping stable engine performance during varying loads. Installation should follow clear safety guidelines due to high-pressure considerations at the source tank.
Maxitrol Gas Pressure Regulator 325-5AL-66
The Maxitrol 325-5AL-66 is a compact regulator noted for compatibility with a 12A39 system and a 3/4″ connection. It’s suitable for LP or NG switching in generator setups where space is a consideration. This single-regulator solution emphasizes straightforward installation and reliable pressure regulation for moderate fuel demands. When integrating with a generator, ensure the inlet and outlet fittings match your hose or piping and that the overall system maintains safe clearance around heat sources.
JDLLONG Converter 039-122 Low Pressure Regulator
The JDLLONG 039-122 is a converter regulator compatible with LP engines up to 30 kW (40 hp) and NG engines up to 22.37 kW (30 hp). It is designed for low-pressure propane or natural gas systems, making it suitable for small to mid-size generators. Interchange part numbers and field references suggest ease of compatibility with a range of engines, including Briggs & Stratton powered applications. Proper mounting and leak testing are critical to ensure safe operation.
Flame King G2R150B-POLa Two-Stage Regulator
This Flame King two-stage regulator uses a POL inlet and a 3/8″-18NPT outlet to support RV and generator gas lines with a 100 lb tank or similar setups. The dual-stage design helps maintain stable pressure under fluctuating demand, reducing gas pressure swings that could affect generator performance. Its robust aluminum and brass construction aims to resist leakage and provide reliable operation in field conditions.
CALPOSE 12FT 2 Stage Propane Regulator with Hose
The CALPOSE regulator delivers two-stage gas regulation for propane systems used with generators, RVs, and other propane-operated equipment. The included 12-foot hose helps reach distant connection points, which can simplify installation in temporary or fixed generator setups. It is rated to support high demand, with stable output and durable zinc alloy construction, while brass fittings resist corrosion and ensure a secure seal.
Buying Guide
Key considerations when selecting a gas regulator for a generator include fuel type compatibility (propane vs natural gas), inlet pressure requirements, outlet pressure range, and whether a single-stage or two-stage design is preferred. Two-stage regulators provide steadier pressure, especially under high load or fluctuating demand, but may cost more and be bulkier. Always verify that the regulator’s inlet and outlet connections match your piping or hoses (NPT, FPT, and size). Safety is paramount: check for leak-tight seals, proper venting, and compliance with local codes. If you’re mixing fuels or using an LP-gas system with a first-stage regulator, ensure correct sequencing and compliance with generator engine specifications. For portability, compact designs with durable materials and corrosion resistance are advantageous. When in doubt, consult the generator’s manual or a qualified technician to confirm regulator compatibility with your engine size and fuel system.