>> Essentially, the pump body is simply a casting, containing nothing but air (or water ;-)
>> ), and to which all the rest of the pump (impeller, motor, control box) bolts.
I've just had a scan round Youtube. Little mention of pump heads being replaced, tho there was one. I kind of assumed there would be a bearing or some such in the pump body, but no it seems the motor is fully contained in a cartridge attached to the pump head. So yes, the pump body is just a chamber with the in and out ports.
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