This MFL (male flare) ball lock disconnect connects to the CO2 liquid-out post of your homebrew keg. It's Black for Beer and Grey for Gas.
You need to attach ¼” inner diameter (ID) beverage tubing with a ¼” barbed swivel nut attached. The threaded MFL connection allows for easy disassembly of lines for cleaning.
If you don't need to regularly remove the tubing you may prefer the barb disconnect.
This ¼” (6.35mm) MFL liquid Ball Lock disconnect connects to the liquid-out post on your Ball Lock homebrew keg. The ¼” (6.35mm) MFL Liquidpost is fitted with a threaded Male Flare (MFL) connection and allows for easy cleaning of your assembly.