Push In Pressure Gauge (0-40 psi)This push in pressure gauge come with an 8mm (5/16") barb and is specifically designed to be compatible with 8mm Duotight fittings. It's the ideal companion to the BlowTie Diaphragm Spunding Valve, allowing you to dial in our blow off setting for your pressure fermentations or pressure transfers. Triple scaled to read in psi, bar and kPa.