General-purpose thermo rubber hose assembly with 1/2" 45° female flare swivel fittings on both ends. 48" (4 ft) length. 350 PSI max rating. UL569 certified for LP and natural gas. Flexible in cold temperatures, resists kinking.
MB Sturgis Inc. has supplied OEMs, distributors, gas installers, and end users with safe, reliable gas connection products since 1959. The 100251-48 is a 1/2" ID thermo rubber hose assembly built as a true general-purpose connection — suitable for any high-pressure propane or natural gas application where a 1/2" female flare connection is needed on both ends.
Each end features a 1/2" 45° female flare swivel fitting, allowing for easy connection to a mating 1/2" male flare fitting without twisting or stressing the hose during installation. At 48" (4 feet), this is one of the shorter standard lengths in the 100251 family — well suited for compact routing between a regulator or distribution point and a nearby appliance, where a long hose run would create unnecessary slack to manage. The thermo rubber construction is specifically chosen for its flexibility in cold temperatures and resistance to kinking, even when routed through tight spaces with multiple bend points.
45° female flare swivel fittings on both ends allow easy connection to mating male flare fittings without hose twisting
Thermo rubber construction stays flexible in cold temperatures and resists kinking through tight, multi-bend routing
Rated for high-pressure propane and natural gas applications up to 350 PSI maximum pressure
Certified to UL569 standard for use with both LP and natural gas applications
Before ordering, confirm the following: 1. Fitting type at both ends: This hose has 1/2" female flare swivel fittings on both ends. Confirm your connection points use mating 1/2" male flare fittings — this hose is not designed for POL, NPT, or quick-disconnect style connections. 2. Length: This listing is the 48" (4 ft) version. The 100251 hose family is available in multiple lengths — verify 48" is correct for your installation before ordering. 3. Temperature range: Rated for -40°F to 140°F. Confirm this range is suitable for your installation environment. If you are unsure which length or fitting configuration your system requires, consult your appliance or regulator's documentation, or contact MB Sturgis directly.
Installation Steps: 1. Shut Off Gas Supply: Close the gas supply at the source before beginning any installation or replacement work 2. Verify Fitting Compatibility: Confirm both ends of your connection points use mating 1/2" male flare fittings 3. Position the Hose: Route the hose avoiding sharp bends, pinch points, or contact with hot surfaces 4. Connect Fittings: Thread each 1/2" female flare swivel onto its mating male flare fitting and hand-tighten, then secure with a wrench 5. Tighten Securely: Tighten both connections to a secure, leak-free fit without overtightening 6. Leak Test: Restore gas supply and perform a soap-and-water leak test on both connections before use Gas line work should be performed or verified by a qualified technician. Always leak-test connections before placing the system into service.
In The Package: • (1) 100251-48 High Pressure LP/Natural Gas Hose — 48" Length • 1/2" Female Flare Swivel Fitting (Both Ends) NOT Included: • Mating male flare fittings • Thread sealant
MB Sturgis Technical Support: Phone: (314) 291-6665 Email: [email protected] MB Sturgis Inc. has supplied OEMs, distributors, gas installers, and end users with safe LP and natural gas connection products since 1959.