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The mechanical part of the tube in the solenoid valves Series A 3 4 9 and NA allows the mounting of various types of solenoids. Mod. G9: special solenoids with incorporated memory for pulsed operation. Mod. H8: explosion-proof solenoids suitable for potentially explosive ambients (ATEX). Mod. U7: solenoids available also with ATEX certification. Mod. B: to be used only with solenoid valves Series CFB (2/1.30).