½" OD Barb Fittings can be threaded into the #891-A Through Vacuum Connector or other vacuum bagging components to reduce the use of hose clamps and/or permit the installation of Quick Disconnects. We supply the #901-A Plastic 1/2" OD barb fitting with all pumps and assemblies, but they might need periodic replacement. Additionally, the #2220-A Brass Barb Fitting is designed to handle harsh environments and should be used in production style applications.