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thank you Free at last and tony for you help will pop in to curzon and get the bits cheers

Hi guys hope you can help me I have al leak on my Diverter Manifold there is two small grub screws which a tight and it is seated right with the DHW Pressure Differential Valve but it still leaks I am also loosing pressure on the central heating system (very slow) 1 bar a week just wondering if...