About this 3D model

A Hamburger Mattenfilter and a Tschechischer Luftheber I designed for my aquarium. I use them in one 30L and one 54L aquarium since about one year without any problems until now. It's designed to be used with a 16mm pipe you can buy at a hardware store like this https://www.hornbach.de/shop/Installationsrohr-starr-M16-grau-3m/5005520/artikel.html You can find the CAD design at https://cad.onshape.com/documents/ad220c7b8ceb65f6bf01717a/w/5258bc9043922dfc103c6f31/e/05911f34657e083ecebeef69