... corrosion resistance.8.The connection parts are in line with new international standards ISO5211 and DIN3337(F03-F25).Pneumatic ... three-piece ball valveModel : ZTQ61(6,8,2)F (N, P, H ... acting (spring reposition)Control: Switch , Adjust .Selection of Accessories: solenoid valve, locator, limit switch, F.R..L. Combination unit. Manua Device ...