Golem gear BOV questions

BGC

Hello,

I received my golem gear BOV with threads for my inspiration.

If i compare the inspi DSV and my BOV, it seems to be different
concerning the number of o-ring that creates the waterproofness.

There is only one o-ring on each side of the BOV that permits the waterproofness?

Do we have to tighten (by hand of course) the outer connectors?
Do you add again the cross-head screws inside the connectors?

Thanks for some explanations.

Bernard