Valves series A1 1/4”, 5/2 - 5/3, electrically operated Version Symbol Code Item 42 5/2 14 12 solenoid/spring 5 1 3 034111 A1E250 Version Symbol Code Item 5/2 14 42 12 034121 A1E251 solenoid/solenoid 51 3 2.73.2