This Duotight fitting allows flow in one direction only and is recommended to protect your regulator from beer backflowing through the line. It opens at 1 PSI to allow the gas to flow out but not back. Place these after any splits, tees, or connections to multiple kegs to ensure a leak in one keg doesn't empty the gas from all of your connected kegs.
About Duotight Fittings - Duotight fittings are very high-quality, high-performance push-in fittings that use a double EPDM seal to ensure a solid, leak-free connection under a variety of situations. This makes it very easy to swap fittings and lines without clamps or fear of leaks.
To ensure a leak-proof seal, please cut tubing as squarely as possible, using a razor or very sharp knife. We recommend the Tube Cutter w/ Duotight Removal Tool for this.