Young's Carboy Rubber Cap with Vents
Carboy Cap With Vents Designed to fit on the 5 gallon and 3 gallon glass carboys This will not fit standard glass demijohns This can be used as a fermenting cap by adding an airlock, But also when racking the wine, put a racking cane in the hole connected with your tubing, then blow down the other hole creating posative pressure and this push's the wine or beer even cider out of the carboy