770132 - Hobart 770132 Grade R Oxy-Acetylene Twin Hose, 1/4 in x 25 ft

Technical Overview of the Hobart 770132 Grade R Twin Hose

The Hobart 770132 is a premium-quality Grade R twin welding hose designed specifically for oxy-acetylene gas service. Engineered to meet the rigorous demands of metal fabrication, maintenance, and repair operations, this hose assembly provides a secure and efficient method for delivering fuel and oxidant to welding torches. The hose features a twin-line construction, where the oxygen line (green) and the acetylene line (red) are Siamese-molded together to prevent tangling and ensure a tidy workspace. The Grade R designation indicates that the liner and cover are composed of rubber materials suitable for acetylene gas but are not recommended for use with LP gas (propane) or other fuel gases that require Grade T oil-resistant compounds.

With an internal diameter (ID) of 1/4 inch, this hose offers superior flow characteristics compared to smaller 3/16-inch variants, making it ideal for medium-to-heavy duty cutting and heating applications where gas volume is critical for flame stability. The 25-foot length is the industry standard for stationary bench work and portable cylinder carts, offering sufficient reach without creating excessive pressure drop or tripping hazards. The hose is rated for a working pressure of up to 200 PSI, providing a substantial safety margin for standard oxy-fuel regulator settings.

The assembly comes pre-fitted with standard B-size (9/16" - 18 thread) brass connection nuts. These fittings are compatible with the vast majority of American-style regulators and torch handles found in industrial environments. The fittings are factory-crimped using heavy-duty ferrules to ensure a gas-tight seal and high pull-out strength. The color-coding extends to the fittings as well, with the acetylene nut featuring the standard notch indicating left-hand threads to prevent cross-connection accidents. This product adheres to CGA and RMA standards for welding hose safety and performance.

Maintenance and inspection of gas hoses are critical for shop safety. The Hobart 770132 is built with abrasion-resistant covers to withstand dragging over concrete floors and contact with metal debris. However, as a Grade R hose, it should be kept free from oil and grease contamination to preserve the integrity of the rubber. This hose is an excellent OEM replacement for worn or cracked hoses on Hobart, Miller, and other major brand oxy-acetylene outfits.