Dumb question on piping/couplers
For a 4" pipe do i need a 4" tbolt or do i add the couple thickness and order and 4.5" clamp ?
Some of the listings i been looking at on ebay say the measurements are ID, some say they are OD and others donet say at all so im kinda confused
Thanks for any clarification
Thanks guys, guess i was over thinking it lol

