Rubber Bungs, 1 Gallon Bored (pack of 10) — pre-drilled rubber bungs that fit standard 1-gallon glass demijohns and accept a standard airlock, letting CO2 escape during fermentation while keeping your brew protected.
Fit with a Handy Airlock or Bubbler Airlock. Need just one? See the single bored rubber bung. Sterilise with Young's Steriliser before use.