Portafilter Pressure Gauge 3/8\"" Fitting 0-16 Bar For Espresso Machines.\n\nA pressure guage that can be fitted to the 3/8\"" fitting on the bottom of your portafilter.\n\nAn essential item that you will need if you want to modify a Gaggia Classic for example to 9 bar.\n\nGauge reads 0-16 bar\n\nWill fit any portafilter with a 3/8\"" thread for the spout.