Valves series A1 1/4”, 5/2 - 5/3, pneumatically operated Version Symbol Code Item 2 5/3 with closed 42 12 034029 A1P270 513 centres 14 42 513 5/3 with open 42 12 034030 A1P271 513 centres 14 5/3 with 14 12 034028 A1P272 pressurised centres 2.79.3