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This 30-inch pigtail hose gives you a direct QCC1-to-inverted-flare connection for running propane from an ASME or DOT tank into your regulator setup. It's built with a 1/4" ID rubber hose, the same style of connector RV and trailer manufacturers use as original equipment, so it's an easy swap when a factory hose starts to show its age.
Keep one on hand as a spare or use it to replace a worn pigtail before it becomes a leak you find out about the hard way.