This Purple Pressure Relief Valve can be used to keep 15psi of pressure on your lager or ale ferments in our Fermenter King P.E.T. Pressure Fermenter/Unitank range.
The purple PRV will lift when pressure exceeds 15psi and will reseal at the end of fermentation when the pressure drops back.
Please note, there will be a hissing noise throughout fermentation when using these PRVs.
Brewers will need to replace the purple PRV with the red PRV to carbonate at pressures higher than 15psi.