Ball Lock Spunding Valve Adjustable Pressure Relief Valve Assembly with Digital Gauge A spunding valve is an adjustable pressure relief valve with a gauge attached to show internal vessel pressure. They are most commonly used to adjust and release pressure on a pressure capable fermenter. It can also be used to release pressure from a keg while filling or filtering.  Gauge size: diameter 76 * 32 cm (with rubber protector), 64*27mm (without rubber protector) Resolution: 0.1 PSI Pressure range: 0 ~ 200 PSI Display: LCD readout, Auto shut off, Blue light background, Battery status in the display. Backlight Off Time: 30s Auto off Time: 150s Gear Shape Rubber Protector Rubber Material: PVC Pressure limit: 1.5 times of the full scale work pressure Instrument power supply: DC3V (2*1.5V AAA battery powered) ( Not included ) This Kit comes with: 1 x Adjustable Pressure Valve with gauge 1 x thread gas ball lock disconnect