Multiple selector for extraction system

Multiple selector for extraction system.   I drawed this tool to manage the extraction of dust and shavings on my work bench. it has 3 entrances and 1 exit the exit used to connect to aspirator and to the other side, I use the 3 entraces, to connect to the tools like saw bench etc its works really well in my workshop and I am sure this will be the perfect solution for many others like me.   measures of pipe fitting: internal 29 mm external 35 mm   to fix on work bench I used 6 pieces of hex nuts and bolts M6   have a nice print and a good experience.