That one is from the hose that I got with a Deros sander. Its the same as the one that came with my Titan (Screwfix) wet n dry vac. It also fits into the hose reducer in the Camvac (which can be just about seen in the background) Checked screw fix, they don't even sell the spare hose anymore. Hose reducers/couplers would work but just thought I'd have a look for connectors before ordering.