This Vacuum Connector is the most economical choice for a reusable, leak-free vacuum port in a basic vacuum bagging or resin infusion installation.Installation is simple: insert base within vacuum bag, then pull threaded opening through a small hole made in the film; slide on O-ring, followed by the nut.Air can be drawn directly from the vacuum bag by attaching 1/2" Vacuum Tubing (#893), secured with our continuous band Hose Clamps (#789).