18" pigtail. Type 1 ACME x male 1/4" inverted flare.
Marshall Excelsior MEC thermal pigtail. Connects propane cylinder to regulator. Type 1 ACME end screws to the tank, male 1/4" inverted flare screws into the regulator.
Please note that some gas regulators require pigtails with regular 1/4" male threads so doublecheck yours before ordering.
If you want the best and safest gas connections, Marshall Excelsior is the brand you want. Lifetime warranty!! Warranty exchanges are instantly done by us. No dealing with the manufacturer.