SECURE PROPANE GAS TRANSFER: The Suburban by Dicor LP-PT12F 12-Inch Pigtail Type 1 Acme Nut ensures safe and easy propane gas transfer in your RV or motorhome. SAFETY FEATURES: UL listed assemblies and CSA approved hose make this pigtail a safe choice. Plus, it features an excess flow device that limits gas flow in case of hose rupture or accidental disconnection, as well as a thermofuse that shuts off gas flow if temperature reaches above 240° F. COMPATIBILITY: Type 1 Acme Nut Pigtails are used with Double Stage Automatic Changeover Regulators for two cylinder systems or Standard Double Stage Regulators with "T" check connections. INVERTED FLARE: This pigtail comes with a Type 1 ACME Nut and 1/4 Inch Inverted Flare for easy and secure connections. 12-INCH PIGTAIL: With a hose size of 12 inches (from crimp to crimp), this pigtail is a great choice for propane gas transfer in your RV or motorhome.