Cavagna (50-A-190-0032 12" Acme LP Pigtail with Hangtag 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 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