This is the breakdown of the parts of the regulator assembly

1. Quick Connect Hose End - This is the part that you connect to Quick Release Connector on the bottom of the power pack.
2. Gas Line Plunger - When the gas line is disconnected this will prevent the gas from escaping.
3. Protective Cap - Do not remove this is to protect the inside of the regulator. DO NOT REMOVE THIS CAP, That action will not be covered under warranty.
4. OPD Valve Coupler - This is the part that you screw onto the OPD valve on the propane tank.
5. The Regulator - This is the regulator itself.
6. Gas Line - This is the gas line that is protected by a stainless steel braided cover.