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The Villiers engined pumps were the 2” inch JAP’s 1.5 inch and I just had a bit of seamed stainless pipe, don’t think the engine shaft was more than 4 inches, so a reamer took the bumps out, the new ceramic seal worked similar to the very simple carbon disc, bit of rubber with a spring to push those bit up against the brass bit the pump body, it wore very little over all those years, its amazing it often would instant pump after standing overnight without the water running back so the clack valve done its job, in the very dry times it help water the stock maybe a field away from the farm it often lived out for a month or so just with a old tin bath hung over drawing water from a pond. It once ran a week every day flat out emptying fire lagoons on a airfield as they were being taken out. and the one pump has a pressure gauge on it and rarely did it better the red line of twenty.