There is a Sealing bushing by OZ Gedny which fits the bill for separating conductors and attaches to the end of the conduit. Type FR IS A COUMPOUND BUSHING UNDER THECATEGORY OF SEALING BUSHINGS FOR STEEL RIDGID CONDUIT. AND TYPE KR IS CLOSE TO THE SAME ANIMAL. i REMEMBER uSING ONE IN A VAULT NOW THAT I FOUND IT IN THE OZ BOOK. Ive yet to see something called a power head but still am interested for downward vertical runs of service conduit terminations if there are any other solutions.