Rubber Double Spout Universal Carboy Blow-Off Cap (Pack of 3)

These caps are used in place of rubber traditional stoppers; they easily fit on to MOST carboys (with an exception of the 1 gallon jug type carboy, and a 6.5 gallon carboy). These caps have 2 openings, one for your blow-off hoses, and one for your racking cane.