Marshall Excelsior ME398P Retro-Q Cylinder Valve Adapter Marshall Excelsior Type 1 Installation Adapter Fitting - 1-5/16 inch Male ACME x Male Soft Nose POL (Shutoff device: Quick Closing), Carded Provides a safe permanent outlet when installed into the household LP Gas system This permanent outlet eliminates the need for smaller containers when operating outdoor LP Gas equipment It is recommended to install a shutoff valve upstream from the installation adapter inlet to facilitate future servicing Provides a leak free means by which outdoor equipment can be safely connected and disconnected without shutting down entire system