If you work in an industrial enviroment, i`ve seen and used (for other applications) in the likes of new pumps etc, blocking plastic bungs for pipe threads, inlets etc...maybe can find those...Or, find some black thick walled hose that will fit snuggly over them, cut to length and glue a disk of the same hose to block off the tops, that would do meantime...cheap and cheerful..but effective...
|