Cavagna (50-A-190-0039) 18" Acme LP Pigtail TYPE 1 ACME NUT PIGTAILS - Pigtails are used with Double Stage Automatic Changeover Regulators for two cylinder systems or Standard Double Stage Regulators with 'T' check connections UL listed assemblies, CSA approved hose Hang tagged for store display Safety features: Excess flow device: Limits gas flow in the event of hose rupture or accidental disconnection Thermo fuse: A heat sensitive plug, which shuts off gas flow if temperature reaches above 240 Degree Fahrenheit