Ferm-Rite Silicone Vent Bung

These are used mostly by wine-makers for long-term storage of wines.  As pressure builds, they allow the gases to "burp" out and escape, but if pressure decreases, the flap pulls tight and does not allow gases to enter the fermenter or barrel.  Made of food-grade silicone.
 
Sizes and Pricing: 
  • Small (1 1/8" x 1 3/8") - $6.95
  • Medium (1 1/2" x 1 7/8") - $8.95
  • Large (1 13/16" x 2 1/4") - $10.95 

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