This bung is made from lead free curing silicone. Suitable for all food and beverage contact.  

Suited to fit the 4L Demijohn - Glass Bottle (1 gallon) or Smaller Mouthed Bottles

Perfect for mini brews

Silicone Bung 19.5 x 38.5 Bored for Airlock / Blow Off Tube

This bung is designed to be used with an Airlock - 3 Piece or Airlock - S shape 

Dimensions:
19.5mm tapered to 28.5mm