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 exitthe exit used to connect to aspirator and to the other side, I use the 3 entraces, to connect to the tools like saw bench etcits 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 mmexternal 35 mm to fix on work bench I used 6 pieces of hex nuts and bolts