Description Air-Line Quick-Disconnects 3mm Barb with Checkvalve  This light-weight, easy-to-use air-line connector for pneumatic and fuel systems allows quick and easy assembly and disassembly of the line. The unit is rated at over 100 psi. It will not twist or kink the air line and is compatible with all pneumatic systems. Coupling Body has check valve to stop air from escaping when you unplug your retracts. Now you can fill your tank at home, assemble your plane at the field and get in the air faster. 3mm Barbs 2 Per Pack