Pigtail

From GAWDAwiki

A pigtail, or hogtail, is a term commonly used to describe the connection between a cylinder’s service valve and a regulator’s inlet connection. The pigtail’s small diameter restricts initial gas flow from the cylinder to the regulator.^[1]

Uses

A pigtail is a flexible connector, meaning its length must not exceed 36". This protects it from tank pressure being delivered to the downstream piping if a leak were to occur. In the event of a leak, the regulator will prevent the tank’s full LP gas vapor pressure to reach downstream.

A pigtail also protects against movement in the gas line. Its flexibility allows it to absorb shock if the gas service line is bumped or moved. Without this flexibility, the piping would be rigid and in danger of leaks if the piping, tank or service line moved.

Pigtails are available in many sizes and bends. They should be replaced whenever the regulator is replaced due to the possible buildup of debris from the propane tank over time.^[1]