Machine tools Vacuum extraction

Workshop vacuum extraction can be frustrating as the extraction port sizes are not standardised and indeed neither are vacuum hoses. Furthermore adapters are expensive and the correct sizes are hard to find. I have made three adapters that function well. The vacuum hose I use has a tapered end for which 31.5mm seems to fit well. I have attached three fusion 360 files which are based on the same underlying model so the diameters can be altered to fit your own requirements. For those fortunat