Blichmann Stainless Steel Spunding Valve - 1/2" Female NPT X 1/2" OD Barb
Carbonate your beer naturally using this Blichmann Spunding Valve. No more worrying about temperature when fermenting your lager-like flavours (at ale temps) now that you can precisely control the pressure from 0 - 35 PSI.
White Labs Yeast and Blichmann Engineering collaborated on this idea and it was found that fermenting under pressure showed a significant reduction of esters (fruity flavours) and low levels of diacetyl (a buttery flavour).
This Spunding Valve with 1/2" Female NPT also features a 1/2" OD barb for attaching a blow-off tube.