Plumbers past and present

 Plumbers adapting to changes from imperial to metric in the 70s A drastic change over occurred during the early 70s in the Uk with the introduction of metric measurement. Before this,  plumbers were accustomed to an imperial system of measurement.  Imperial pipes are measured using the inside diameter of the pipe. Copper pipework in installed before the 70s will probably be sized in imperial measurements - 1/2 inch, 3/4 inch, 1 inch, etc. The metric pipe is measured using the outer di...
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