I'm no expert, but the one big vacuum bagging project I did, I just used cheap hose barb fittings. I made my resin trap from PVC pipe and fittings glued together. I think I got most of my bits from Home Depot (in the US). I also got some of my supplies from here: https://www.fibreglast.com/category/Vacuum_Bagging but this was 8 years ago and there may be better options now.