This 3 Gallon carboy has a hole to accommodate a Carboy Adapter and High-Flow valve(spout assembly - sold separately)
Other Options - Dry Trap Air Lock and PET o-ring closure(airlock assembly - sold separately)
Overall � 19 cm (7.5") square 49.1 cm (19 1/3") high
Neck � ID 45 mm (1.77") / OD 55 mm crown
Volume � Nominal 3 US Gallons (11.4 liters) [ filled to bottom of neck ~11.6 liters]
Pressure/Vacuum Limits � 0.14 bar (2 psi) and -0.05 bar (-0.75 psi) at 25� C (77� F) � Though very sturdy, this square carboy is not designed for significant positive or negative pressures.
Temperature Limits � -30 to 60�C (-22 to 140�F)
Special Features � The 3 gallon capacity yields fifteen 750 ml bottles of wine and is ideal for ice wine kits and for making good use of the unpredictable volumes of juice created from whole fruits. The square shape makes efficient use of space in a refrigerator.
Material Notes � The special PET, used to make BetterBottle carboys, is non-absorbing, non-porous, and non-wetting (hydrophobic), so it will not carry over flavors from one batch of wine or beer to the next.