the outside diameter of ABS pipe doesn't change depending on wall thickness - the inside diameter does.
pipe sizes are here : http://www.epco-plastics.com/abs_technical.asp (scroll down to ABS Imperial Pip Dimensions).
So it looks like the caps should fit fine. Still worth checking with an actual piece to make double sure they fit before doing the full order though.
@dt started
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the outside diameter of ABS pipe doesn't change depending on wall thickness - the inside diameter does.
pipe sizes are here : http://www.epco-plastics.com/abs_technical.asp (scroll down to ABS Imperial Pip Dimensions).
So it looks like the caps should fit fine. Still worth checking with an actual piece to make double sure they fit before doing the full order though.