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