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  1. Copper Diameter and Pressure

    [QUOTE=hj;328503]quote; the galvy pipe being fulla rust. Rust will cause friction that will reduce pressure but at the same time its restricting the volume. This is why you can run one fixture without any issue.......

    I do not see anything in the original posting which even mentions galvanized pipes. The problem is undersized main lines. 3/4" copper will probably give you the best results. 1" would be much more expensive and while it has the potential to deliver more volume, ...