This tip has a 46mm outside diameter and is designed with a small reduction at one end, this is to stop rocks larger than the internal diameter of the hose entering, thus almost eliminating hose blockage to the sluice.

The vacuum hose, has an internal diameter is 40mm so the "vacuum tip" fits firmly into the vacuum hose and does not require a clamp, to fit the tip into the hose easily, you can dip the end of the vacuum hose into hot water before insertion.