Here is a picture of what you should have, notice the blue cover this sits over the aquaroll hole, yours has an inboard pump so only has one pipe to the aquaroll.
The science behind this is that like any container that contains liquid, there is a volume of air between the liquid surface and the top of the container and as the liquid is dispensed by whatever means (in this case is via the water pump) the volume of air increases thus creating a vacuum above the liquid surface. The vacuum then sucks any remaining air which in turn makes the container collapse inwards so to eliminate the vacuum, the volume of air has to breathe. This is usually done by means of a breather pipe or removal of an independent cap to allow air in above the liquid surface which an Aquaroll doesn't have so the only solution is to have a loose fitting gaiter over the entry port to allow air in which is quite the norm and standard practice in this instance. What you have is a barrel with no form of air intake whatsoever so as the water drops, the vacuum increases which then sucks the water barrel inwards which is exactly the problem you are encountering. The solution is to either have the existing screw cap loosely fitted on top of the Aquaroll or change the style of fitting for the barrel to breathe.
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Quote: Originally posted by Tomyates on 27/9/2020
Cheers! Left the top loose sorted the problem
Glad the problem is sorted.
I do appreciate, when you are new to something, it is easy to find yourself in a situation where you need good advice. That is what these forums are all about. Glad we could be of help.
Remember, whatever your problem, you can be sure someone else has experienced the same problem thing.