Please don't forget to like ;Piston pressure re gauge connection: Rp 1/2”.Nickel plated brass : water, glycol solutio (max. 50 %) and compressed ature range: 0÷130 °C (no freezing).Max. working pressure (PN): 16 pressure regulation range: 1÷5,5 bar.Réducteur de pression à piston Giacomini R153C 1/2