Nilfisk Attix plug

This is a plug for Nilfisk Attix shop vacs in situations where you want to transport the shop vac without the hose plugged in. To avoid dust escaping the gaping hole, use this plug.
Mine is used on a Nilfisk Alto Attix 360 - 21 and is hooked on to the shop vac by a little chain screwed into machine and on the plug side, the chain Is fastened to the center of the plug using an M3 bolt and nut. The model has a 3mm hole for this reason.