For the installation of my water softener I needed an airgap between the softener and the sewer.
An 1/2" hose wil fit on the top whit an hose clamp.
The outlet is customizable an will fit in to an 40mm drainpipe
The airgap is made with two parts and printable without support. The two parts fits snugly together and can eventually glued together with some CA glue
The author hasn't provided the model origin yet.
