[stephen low]

Mike

I had to go the angled inlet to minimise size and simplify hose routing and did suspect it would cause this issue but needed to live test it to actually find out.

Am trying to understand and picture your description, it certainly sounds right. Can you draw a picture to expand the thinking.

I suspect what I am picturing is not quite what you are suggesting - lol

And thanks for the idea of using plastic initially that should speed up and simplify the testing.

Cheers