These little guys are incredibly functional! Made out of rubber, these carboy caps can different size blow off tubing, hold a racking cane during transfers, fit an airlock and a blow off tube just in case, the possibilities are endless.
For use with our 3, 5 or 6 gallon glass carboys with smooth necks.
TIP: Carboy hoods are exceptionally useful for blowoff tubes. Just add 3' of 1/2" racking tubing into a bucket of water as your airlock.