Those orings are usually 1/16" thickness. If the OD (outside diameter) is 1 3/4", then the oring is #030. If the oring ID is 1 3/4", then it's a #031.
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
by The Pointer Sisters