TECHNICAL FEATURES Minimum and Maximum working temperature:Water: 0° C, 90° CGas: -20° C, 60° CAvailable: In all sizes from ⅜" up to 4"Thread: ISO228 - DIN259 - Bs2779. MATERIALS Valve Body: Brass CW 617 N.Stem Seat: Nylon 6.Seat: NBR 60 SH/A.Spring: Stainless steel - AISI