Description Overflow Vent Add-On Kit High Flow Series NEW HIGH FLOW SERIES! 3/16″ I.D. High Quality Fittings! This is an add-on vent fitting and cap ONLY! If you already purchased our high flow vent system, this kit contains everything needed to add Startup-Overflow vents to additional aircraft. For use with RCF69001HF High Flow Startup Overflow Vent System. Includes: Flush Mount Vent Fitting with washers and locking nut Vent Seal Cap with Remove Before Flight Ribbon