Relief FermentMate™ 16oz PET Reusable Natural Carbonation Bottles with Tamper-Evident Caps – Pressure-Regulating Bottles for Beer, Kombucha, & More (8-Pack)

Take control of natural carbonation and bottle conditioning with FermentMate PET Fermentation Bottles—a versatile solution for brewing fizzy favorites like kombucha, craft beer, sparkling wine, and more. Once placed on the bottle, the cap’s integrated pressure relief valve maintains a consistent internal pressure—keeping your beverage naturally carbonated without the risk of over-pressurization. Each cap also features a tamper-evident ring, which separates from the cap body after the first opening. This provides a professional and secure indicator of prior use—ideal for both personal and shared brewing environments. Each Relief Cap is equipped with a Pressure Indicator Fluid Well. By adding a small amount of water, the Fluid Well—on the top of the Relief Cap—acts as a venting indicator. CO₂ bubbling through the water signals that the internal pressure of the bottle has reached the set point of the cap. This simple mechanism makes it easy to monitor your batch at a glance and know exactly when your beverage is fully carbonated and ready to enjoy. Looking for different pressure levels? FermentMate replacement Relief Caps are available in five color-coded pressure ratings, giving you total control over carbonation intensity—from gentle to highly sparkling. Producing a new actively fermented beverage? We offer wholesale bulk solutions. With our technology, you can bottle while your fermentation is still active, keeping the cultures active and lively. Simple, safe, and scalable—FermentMate makes fermentation easy.

• 【Includes Green Relief Caps】– Each 16oz PET bottle comes with a green relief cap featuring a built-in silicone valve to maintain optimal carbonation by venting excess pressure during fermentation.
• 【Tamper-Evident Ring】– Relief Caps include a breakaway ring that snaps upon first opening, offering a clear visual indicator of whether a bottle has been previously opened—just like store-bought beverages.
• 【Perfect for Fermented Beverages】– Designed for active fermentation of naturally carbonated drinks like kombucha, home-brewed beer, sparkling wine, mead, and more.
• 【Compact & Practical Design】– 16oz bottles are easy to store, handle, and clean—great for single servings, test batches, or small-batch brewers.
• 【Customizable Pressure Options】– Expand your setup with replacement Relief Caps in multiple pressure ratings and colors (sold separately): 🔴 Red (Very Low – 8.7 psi) 🟡 Yellow (Low – 12.3 psi) 🟢 Green (Normal – 16.4 psi) 🔵 Blue (High – 20.5 psi) 🟣 Purple (Very High – 24.9 psi)
• US Owned & Operated: Relief Innovations is US owned and operated, with domestic management and customer service. Our products are produced domestically and internationally, with domestic quality management systems. As a domestic company, all of our products are required to meet regulatory compliance.
• Professional Packaging & Compatibility: All Relief products are manufactured to strict quality standards and are sealed with tamper-evident packaging. Every item leaves our facility sealed, dry, and fully operational. For order handling inquiries, please utilize your standard account options. Relief Innovations is available for technical product questions.