When I should attach wet lens on the housing?

[Plotek]

I have very basic question. On my previous housing, the WAL was installed all the time, but sometimes I have to just unscrew little bit and release air bubbles.
New housing with RX-100 looks different. Connection between housing and lens is better sealed so when I go under water there is still air and I have to unscrew lens completely. Is that is typical for wet lenses?

 

[alien]

Yes can be. Usually need to burp them

 

[Plotek]

This is pity because I bought acquapazza housing which is not made from one piece of aluminum Lens is attached to short tube which can be unscrew together with lens !!!! I almost flooded my camera during first dive when I was trying to remove air

 

[alien]

bad design

 

[Plotek]

bad design

Exactly this housing has option to attach 28LD "port" but actually this is not port like in bigger housings .... I have to be very carefully now ... or I have to customize new housing