To maintain the quality, carbonation, and shelf life of your beer, transferring under pressure in a closed system is essential. By matching pressures and eliminating oxygen, you prevent flavor loss and "wild" foamy dispensing problems.


1. The Superior Purge: Liquid Displacement

Standard gas purging often leaves residual oxygen. For a truly oxygen-free environment, use the liquid displacement method:


  • Fill Completely: Fill your receiving keg or fermenter to the absolute brim with sanitizer or sterile water if already sanitized.

  • Push with CO2: Connect your CO2  tank to the "Gas In" post and use regulated pressure to push the entire volume of liquid out through the "Beer Out" post into a bucket or drain.

  • The Result: This leaves the keg filled with 100% CO2 and zero oxygen, already pressurized and ready to accept beer.


2. Proper Connection for Gentle Transfer

The way you connect your lines determines how much turbulence—and therefore foam—is created during the move/


  • Kegs: Connect your transfer line to the "Beverage Out" (liquid) side of the receiving keg. This allows the beer to enter through the internal dip tube and fill from the bottom up, significantly reducing splashing and CO2 breakout. 

  • Fermenters: Many modern fermenters include floating dip tubes to rack from the top down. If your fermenter does not include this option, connect to the lowest available port or the "General" filling on your fermenter to ensure gentle transfer.


3. Balanced Pressure Transfer

Transferring carbonated beer requires maintaining a stable environment to keep CO2 in the liquid.


  • Match Pressures: Before starting the transfer, ensure the pressure in your receiving keg matches the pressure in your fermenter.

  • Temperature Control: Keep both vessels cold. Beer is most stable between 32°F-36°F. Beer stone or crystallized buildup in lines can cause turbulence, so ensure all transfer hardware is clean.

  • Use a Spunding Valve: Attach a spunding valve to the gas post of the receiving keg. This allows you to precisely control the "exit" pressure. By setting it 1-2 PSI lower than the fermenter, the beer flows smoothly without "flashing" into foam.

  • Use a Flow Stopper: To prevent overfilling and messy cleanups, integrate an automatic flow stopper. This will shut off the transfer the moment the beer reaches the top of the keg. Attach this between the keg and spunding valve.


4. Related Products


  • FE964 - Duotight BlowTie 2 | Complete Kit | Diaphragm Spunding Valve | Built-In Pressure Gauge | 0-15 PSI

  • DUO250 - Duotight Flow Stopper Automatic Keg Filler

  • FE965 - Ball Lock Adjustable Pressure Relief Valve | Quick Disconnect (QD) | PRV & Integrated Pressure Gauge