Double thread ducted vacuum hose joiner. This joiner is used to join two pieces of standard vacuum hose together, eg. to extend the hose length, or to repair/join a split hose. Cannot be used to join a switch hose (hose with ON/OFF switch on the handle).
Both ends take 32 or 35mm* ID standard ducted vacuum hose.
Please note that the joiner has a reverse thread, ie. anti-clockwise to fasten it or clockwise to undo it.
*) To join 35mm hoses together, dip the joiner in hot water for a couple minutes to soften and expand the plastic a little.