NilfiskCFM 50mm hose industrial vacuum cleaner to quick connect adaptor.
Used to connect soft accessories such as the rubber gulper, in the foreground of the photo to the rubber or plastic hose cuff.
Use to join hose easily, cuff to cuff, OR THE CHEAPSKATE way, simply join the hoses with this, jammed up the inside bore!
This is also available in 40mm and 70mm
At the moment, as standard postage within Australia, is capped at a maximum of $20, maximise the saving on postage and buy some of the related parts below, such as dustbags and a new hose, or a new floor tool and some other accessory!