I am trying to convert a paint pressure tank into a resin trap for Vacuum Infusion. I have it all set up except I don't know how to make a fitting for the resin outlet tube to the trap inlet, without resin adhering and plugging the resin trap inlet after cure.

For example if I connect tubing to a barbed valve the resin will adhere to the valve after passing through and I would have to replace the barb valve(ball valve) after each use.

Maybe I'm missing something obvious but does anyone know what fittings to use so that only the plastic tubing needs to replaced with each use.

You can modify most standard fittings by drilling them out so that the tube will pass all the way through rather than inserting only to a stop. I've always found this far easier than searching for special fittings that will also be more costly. "Heat exchanger tees" can also be used. These are tees designed to allow you to make a tube-in-tube heat exchanger from standard tubing.

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