Dust Collector Coupling with 2-1/2" Connection

cults3d

I am installing dust collection in my Fab Lab. I elected to use 4" schedule 20 sewer pipe to run along the back of my counter tops. I had originally planned to have a 2-1/2" hose adapter at each station. However, doing so would have required a Schedule 20 to Dust Collection fitting, a T-coupling with a 2-1/2" reduction, and a street elbow, followed by another Schedule 20 to Dust Collection fitting to go back to the Schedule 20 pipe, and on to the next workstation. To save at least $20 for each workstation, I designed this coupling (or at least that's what I'm calling it). The top has a male-end to connect a blast gate and a 2-1/2" hose. It is sized just right to fit on a Makergear M2