Spunding Valve with GaugeSpunding valve is a must have for fermenting under pressure or transferring under pressure. A Spunding Valve is used to adjust and release pressure on a pressure capable fermenter, such as a Unitank. It can also be used to release pressure from a keg while filling or filtering. The relief valve can be adjusted to release pressure from 0 15 psi. Pressure Fermentation Pressure fermentation is becoming all the rage in homebrewing, across all levels and