Compact & Reusable Design: Lightweight and easy to clean after each batch, these fermentation airlocks and stoppers are reusable for multiple cycles, making them an economical for hobbyists and small-scale wine and beer makers. Clear Bubble Indicator: The transparent S-shaped airlock allows easy visual monitoring of fermentation activity through bubble flows, enabling timely adjustments by the brewer to enhance product consistency and success rate. Versatile Fermentation Tool: Compatible with various brewing needs, the S-shaped bubble airlock design allows safe gas release while blocking air entry, supporting optimal yeast and activity for consistent, results in home brewing and preservation. Reliable & Food-Safe Material: Made from premium, BPA-free plastic, these airlocks resist cracking and deformation during fermentation, ensuring safe contact with all types of fermenting liquids and vegetables without affecting flavor or quality. Easy Installation & Secure Fit: Designed with included rubber stoppers, these 3Pcs airlocks provide a tight, leak-proof seal to ensure effective fermentation for wine, beer, sauerkraut, and pickles. Reliable materials prevent contamination and maintain freshness.