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The end of the flue pipe must line up Page 8 LA30iB 3.99 Central Heating Flow Central Heating Return Drain Cock at Lowest Point Drain Cock Indirect Hot Water Cylinder Cold Water Tank Overflow Feed and Expansion Tank 22mm Open Vents Gravity Radiator Circulating Pump Central Heating Return Drain Cock at Lowest Point Drain Cock Indirect Hot Water Cylinder Domestic Hot Water Draw Off Cold Water Tank Overflow Overflow Feed and Expansion Tank 22mm Open Vents Gravity Radiator Circulating Pump Injector