Quick easy question: How to tell swingvalve size?

[Subliminal]

I just measured my swingvalve and it looks to be 3 inches across on the outside, and the center of the hole is 2 inches or so. How do I measure my swingvalve?

d

[Subliminal]

Oops, nevermind. Too big for the bolt holes to line up on my 2.25 inch downpipe. Guess that makes it a 2.5 inch, eh?

damon

PS - DUR! to me.

[aerosmith145]

chris, what size does this look like? I know it's probably 2.25, but is it a large flange? Bought it off ebay and haven't yet recieved it.