Router Table Vac

What I am showing is how to connect a shop vac hose to a 4" connection.

The plunger works well to couple the shop vac to the router.

The lip inside the plunger (bottom side) was cut by approx 1"
The top of the plunger was cut to fit a hose thru the top.

This plunger holds a good seal and is easily removable.