Hoping the photo uploaded. I bought standard blue barrels to build floating docks but am unclear on a couple things. The photo shows one of two openings on the top. The other is open to use a bung tool to open. This one, however, has this unmovable plastic lid with a silver seal around it. Is there a standard bung under it? Should I break the cover off to reveal the bung to then screw it out and use some plumbers dope to seal it, as I intend with the exposed one?
