These caps are a great option for home brewers.
Rather than needing a double ball lock spear for each keg you can use these.
The carbonation cap is great for those who prefer force carbonating using a CO2 regulator. Simply screw it into the keg, attach your gas line or mini regulator and set to the desired pressure. Using a line splitter or a gas manifold you can carbonate multiple kegs simultaneously or have one with ball lock spear and be pouring from it while others with these caps carbonate.