This is modeled after a Shop-Vac's hose attachment on the vacuum side. It is specifically designed for a 6-Gallon QuietSeries vac that I found that had the hose broken off. Work In Progress (WIP): Need to actually fit it to see if it works properly.
(2017/03/29: Test fit the part last night. Just a hair too big, doesn't seat well. Will have to double-check against original and shrink it slightly.)