professional quality: 1,The working air pressure:3.0mpa, 2,Suitable medium:R12,R22,R502...... 3,Suitable temperature:-50 professional quality1.The working air pressure:3.0MPa, hydraulic pressure:6.5MPa;2,suitable medium:R12.R22.R502.R407c.R134a.R404a.R410a etc. Refrigerants and other refrigerating oil;3.Suitable temperature:-50-+150°C Yongda Refrigeration Stop Valve