NOT recommended for use with small or medium universal stoppers. The PLAATO Valve fits most airlocks including PLAATO Airlock, standard 3-piece, and S-shaped airlocks and is made out of FDA-approved food-grade polypropylene with an internal silicone valve. PLAATO Valve has an incorporated umbrella silicon valve that only opens if a negative pressure occurs, bypassing the airlock and hence eliminating suck-back. In most cases, air will be introduced in the fermenter in the hours before the fermentation starts, and during cold crashing. To offset this negative pressure, the fermenter will either suck in water from an airlock, or suck in air, or in some rare cases implode under the forces of this pressure. This is seen the moment a fermenter is placed in a temperature-controlled room after pitching yeast, or during cold crashing. This phenomenon is due to temperature changes that in turn lead to negative pressure in the fermenter. Many brewers experience suddenly empty airlocks, or water flowing from the blow-off vessel into the fermenter. No more sucking airlock liquid back into your beer when cold crashing! Largest Wine & Beer Making Kit Selection Thank you for visiting one of Florida's largest homebrew beer and wine making stores - Southern Homebrew Equipment and Wine Making Supply for all your wine making supplies and beer making supplies for home wine making and home beer brewing. PLAATO Pressure Drop Equalizing Valve V2 connects between your fermenter's stopper and airlock or blow-off-tube and equalizes any negative pressure that might be present in the system, eliminating suck-back.
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