This is an adapter to better direct the exhaust from a BambuLab P1S or an X1C. I just wanted to direct the flow out a window when printing ASA and Nylon. There are other options out there, but most of them don't have the 90 degree bend to be able to push up against the wall or they do not direct the air flow smoothly like this one. There is a rib around the outside to make a better seal when used with a hose clamp. It prints well with minimum support, and takes about ~125g and prints in ~4hrs 30 mins. 9mm magnets can be inserted into the holes, but you may need some support for the hose itself to keep the hose from pulling it off the back of the printer. It has a slot in the bottom where you can take a piece of rubber or maybe a large rubber band and use it as a gasket to make a seal. The duct size of the outlet is 4".