Pro Spunding Valve with Scale with Gauge  Spunding valves enable fermenters to both ferment under pressure and condition beer before transferring to a keg.  The scaled version includes an etched sleeve with a scale between 0.2-2.2 BAR, along with a pressure calibrated spring.  This version is perfect for a home or nano brewer that wants to be able to dial in pressures on the fly without having to match the release pressure using a gauge. The scaled version also features a pressure release knob to quickly and easily verify or equalize tank pressure.  The polycarbonate cup is designed to hold sanitizer so that the tank remains 100% sanitary throughtout the couse of the fermentation process.  Please note: Always leave the fixed pressure PRV in place, never exceed the maximum rated working pressure of the vessel at anytime during operation.            Features:     All 304 Stainless Construction   Only for use with pressure rated Unitanks   1.5" TC interface   Removable sanitizer cup   Easy disassembly for cleaning