This Carboy Cap fits 3, 5, and 6-gallon carboys (does not fit 6.5-gallon carboys).
Fits tightly around the carboy mouth
The two openings are convenient for attaching or inserting tubes, airlocks, siphons, or racking canes.
Instructions: 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 to the racking cane, thus starting your siphon.
Caps for both openings are included.
Flexibility and usefulness in combination with other equipment.