wildebus
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Also known as an Expansion Vessel (that's what I call them ).Do what now?
Expansion tank - Wikipedia
en.wikipedia.org
Where you have a system that does what yours does and there is no actual fault, these can eliminate those annoying glitches of pump activity.
I fitted one as part of my plumbing in the last camper.
Clarence Water System by David, on Flickr
They are small, inexpensive and and added bonus is if you open the tap a little way, the pump might not need to come on (so can use the bathroom tap or even flushing the loo without the pump powered)
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