Hi
Well bit confused as there is no air valve with any of the units we have in stock, where did you purchase the unit? There is the elbow that screws into the collection cup where the airline is fitted. This is called the air intake kit.
To adjust the skimer you move the body up and down in the bracket until you get the right skimmate, by doing this you are adjusting the back pressure.
The skimmer will skim wet for a while like all skimmers as they bed in.
Instructions - yes we will be removing pigeon English and replacing with Queens
Email me at
sales@aqua-digital.com of you need more help as I am not online much at weekends, but am on email.