Used for vacuum bagging. This port is a quick connect to a vacuum hose. Uses 1/4" NPTF fitting as shown.

11-25-2014 Files replaced for proper sizing. They should be sized for metric.

4 Shells, 50 % fill, .1 mm layer. .2 should be fine. No support/No raft.

They are a tight fit but loosen up after working the upper and lower sections together.