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South Australia | It sounds like one pump is older than the other. All the newer pumps have this drain hole in them for that very purpose, so there is no reason you cannot drill one yourself. As the others said though, be careful not to go too deep.
Also, the only difference between diaphragm and cetrifugal pumps is hydraulic drive standard on centrifugal, but you cannot run a centrifugal pump for any more than 60 seconds DRY without doing damage, unlike a diaphragm that can run for hours and hours dry with no damage. So, mount a hydraulic drive to the front of your diaphragm pump to do away with the PTO, and if looked after, it will give you years of service. (I know of hardi 6x diaphragm pumps that have done way over 10,000,000 Litres and still going!) | |
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