Conflat fittings compatible?

[Matt_Gibson]

I’ve got a 4 way cross that has two 6in conflat flanges and two 2.75in conflat flanges. All of them use copper gaskets. I found a 6in conflat viewport, but it uses an o-ring instead of a copper gasket. Is there any way to make this work with my cross?

[Liam David]

If the o-ring lines up with the knife edge on the cross, then probably. Without more details it's impossible to say. Conflat fittings in general do not requite copper gaskets - there are square profile o-rings specifically made for them.