Stainless steel case with safety vent at 12 o'clock and brass Bourdon tube. Botton brass connection 1/4’’. Plexiglas indicator, 63 mm diameter.C lass 1.6. Bourdon tube. For non-corrosive fluid between -20°C and +60°C. Complies with EN 837-1. IP 65 filled with glycerine used to slow down the movement of the needle in dynamic application.