grey water to 32mm spiral hose adapter for Rimor motorhome

When I got my 2007 Rimor motorhome I wondered about it's grey water outlet. It's a simple hole on the underside operated by a slider.
But most european camping sites have grey water drains at every lot located near the fresh water tap. With the grey water outlet on my motor home these were unusable.
So I designed an adapter to a 32mm spiral hose which is commonly used for this purpose.

For better printability the part was divided in two parts which have to be (super)glued together after pri