Double Bubble Air Lock "S-Type"

Keep an eye on your ferment — every bubble counts.

The S-type double bubble airlock is a favourite among home brewers and winemakers for its simple, reliable design. Watch CO₂ bubble through the two chambers to confirm active fermentation, while the liquid seal keeps bacteria and wild yeast locked out.

Why brewers love it:

• Works for beer, wine, cider, mead, and distilling
• Snap-on cap — less likely to get lost
• Vented cap design allows easy pressure release
• Two small chambers let you visually monitor fermentation activity
• Rounded stem creates a better seal with rubber bungs & stoppers
• BPA-free materials — safe for food contact
• Max temperature: 60°C (140°F)

Pro Tips:

• Do not fill with pure water — use a sanitizer solution to prevent contamination through the airlock itself