according to his site, each wall is 1/8, thereby giving a 1/4 total (remember, there are two walls) so 1/2" ID 3/4" OD. for it to be 1/4" wall on each side, would give 1" OD. so i am pretty sure they are the same thing.
taken from your link to USPlastics:
Quote:
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Clear Tubing For Chemcials 1/2" I.D. 3/4" O.D. and 1/8" wall
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i will email him and see if it is indeed 3/32, or 4/32. it doesn't really say, just says:
Quote:
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Please choose 1/2"ID or 3/8"ID x 1/8" wall when ordering. The 3/8" Tygon will also stretch over 1/2" barbs
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