So what do I need to do to use compression fittings on an Apogee GTZ block?

[Z Overlord]

I heard some people say two o-rings and some say removing the "Swiftech" logo from it. which one ?

[MpG]

Removing the logo definitely helps, but the bigger problem is that most compression fitting don't have very thick o-rings, and the countersunk threads that the GTZ (and many other Swiftech products) uses. Your best bet is to take off on of the o-rings, head down to your local store with a plumbing section, and grab two orings that are about the same diameter, but noticeably thicker. The goal is for the comp fittings to not have to be screwed beneath the surface of the block.

[KaptCrunch]

go with fatter 0-ring as MgP stated to open the flow path

[Jackquelegs]

Um.. I never had a problem with my BP Compressions on a vanilla GTZ

[AmuseMe]

Dont stack o-rings, its a bad idea. Like mentioned, get a thicker o-ring, or remove the logo. No one likes logos anyways

[MpG]

Originally Posted by AmuseMe

Dont stack o-rings, its a bad idea. Like mentioned, get a thicker o-ring, or remove the logo. No one likes logos anyways

Oops, never even caught that part the first time in the OP - yes, never stack o-rings. They tend to slip and twist inside each other under pressure, and that's a prime situation for a leak under pressure.

[gingerbee]

Originally Posted by AmuseMe

Dont stack o-rings, its a bad idea. Like mentioned, get a thicker o-ring, or remove the logo. No one likes logos anyways

listen to them never never stack O-rings like i have mine stacked because it's a real bad idea and i am waiting for it bite me in the a$$ and i ma not being a dick at all i really need to change them i have gotten away so far but i have thicker O-rings on my desk. As i keep my fingers crossed

Just run to a hardware store not homedepot they only sell them in assorted bundles, check homehardware.
if I get time this weekend