Standard Carboy Cap

Put your racking cane into the middle hole of the cap. Then, to start the siphon, blow into the other hole. Air pressure on the liquid will force it up the racking cane, thus starting your siphon!

Want to avoid spills from a vigorous fermentation or collect top-fermenting yeast for re-use in another batch? Insert a racking cane into your carboy through the center hole of your Carboy Cap, keeping the other hole closed. Cap a small overflow vessel (like a 3 gallon carboy) and run a tube from the racking cane into the side hole on of the cap on the smaller container. Insert your airlock into the center hole of the overflow vessel's cap.