Pigtail makes the connection from the propane tanks on your trailer to the propane regulator. Also used to connect tanks to a high-pressure regulator to carry gas to a 2-stage regulator. Check valve prevents hazardous backflow leakage.

Hose connects the remote tank on your travel trailer to your high-pressure regulator. Type 1 connector provides a high rate of flow before going into bypass mode. Back-check prevents gas leaks.