POK duotight 8mm x Flow Control Ball Lock Disconnect (Liquid Black + Yellow)

If you want an easy way to balance your beer lines this is the way to do it.  Please be aware that even in the fully open position these FC disconnects do have some inherent flow resistance so you should use either shorter line or larger ID line that you would when compared with traditional ball lock disconnects.  One of the benefits of FC disconnects is you don't need to rely on the small ID or line length to apply flow resistance so it would not make sense to use long lines or small ID lines as well as this is the job of the FC device.