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When the rubber LP supply line running to a furnace, water heater, or range gets stiff, cracked, or starts smelling like propane, it needs to be replaced before it's used again. This JR Products hose is a 24-inch length of 1/4" rubber LP line built to OEM dimensions, so it drops into the same spot as the factory hose it's replacing.
It's a simple, no-frills part - the kind of thing worth keeping on hand for LP appliance service calls or a seasonal once-over of your gas lines.
Always have LP connections checked for a proper seal after installation, and follow your appliance manufacturer's fitting torque and leak-test procedure.