PLAATO Valve V2 - Pressure Drop Equalizer for Airlocks

Item Number: 43398

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Eliminate Airlock Suck-Back!

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. No more sucking airlock liquid back into your beer when cold crashing! 

Many brewers experience suddenly empty airlocks, or water flowing from the blow-off vessel into the fermenter. This phenomenon is due to temperature changes that in turn lead to negative pressure in the fermenter. This is seen the moment a fermenter is placed in a temperature-controlled room after pitching yeast, or 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. In most cases, air will be introduced in the fermenter in the hours before the fermentation starts, and during cold crashing. PLAATO Valve has an incorporated umbrella silicon valve that only opens if a negative pressure occurs, bypassing the airlock and hence eliminating suck-back.

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. 

Note: Compatible with rubber stoppers. NOT recommended for use with small or medium universal stoppers.


  • Eliminates Suck-back during fermentation & Cold crash
  • Empty Airlock Protection no suck-back minimizes the chance of an empty airlock and air entering
  • Transfer Protection lets you keep the airlock on while transferring

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