bailey alu-tech

Hi. I set up my water on my Bailey unicorn Madrid this weekend and noticed a leak coming from the stem tee adaptor which is circled in red. When I had the pump on and taps open the water ran fine but as soon as I closed the taps it’s almost like the pressure built up and started leaking out this...

I've been hearing that the Bailey Alu-Tech caravans have a tendency to let water seep through. Is this true? I would have thought that since they use fewer panels, they would be much better at preventing water ingress. Does this also mean that the Alu-Tech caravans also get a lot of damp? I can...