Plastic piece that screws on a standard gallon. Use this instead of a bung with hole to ferment with an airlock on a glass gallon.
Screw on to the gallon jar for perfect sealing and never pops ups.
Replaces the bung for a 1 Gallon Jar.
Cap with molded hole to accommodate both our Double Bubble Airlock and Three (3) Piece Fermentation Lock.
Fermentation Lock Sold Seperately.