- One piece, Self-sealing, Waterless
- Fermentation airlock
- One-way valve | CO^2 can escape & O^2 can enter
- Silicone | Dishwasher-safe
- BPA-Free & Phthalate-Free
- Eco-Friendly & Economical
- Fits any “wide mouth” standard-sized mason jar (not included)
- Screws on with any “Wide-Mouth” mason jar band (not included)
- Dimensions: 3.5" x 3.4" x 3.1"