Norgren venting opening leak

[Fratto]

Thanks Joe and Mike

Replacing the bottom norgren seems straight forward. Joe, I understand that you prefer to use new compression fittings on the new valves and go to compressions right?
By the way, are the push to fit removal pliers worth it?

But the top valve on the stack, how does it come off of the manifold? Any youtube or other videos out there on this?

[Fratto]

Also, all of the existing fittings have sealant on them ... what kind do you recommend for the new fittings?