What is the role of a pigtail in propane connections?

• A. A fixed metal pipe between cylinder and regulator
• B. A gauge used to measure pressure
• C. A flexible hose connecting the regulator to the appliance
• D. A safety valve

Answer: (C)

Propane systems rely on a regulator to reduce cylinder pressure to a safe operating level for the appliance. The pigtail is the short, flexible hose that connects the regulator to the appliance, allowing for movement, vibration, and temperature changes without stressing the regulator or fittings. Its flexibility also aids installation in cramped spaces and helps maintain a reliable seal by accommodating misalignment and shifting. A fixed metal pipe wouldn’t tolerate movement as well, a gauge is used to measure pressure rather than transfer gas, and a safety valve is a separate protective device. So, the pigtail’s role is to provide a flexible connection between the regulator and the appliance.