Where on the internet can I buy a 1/2" wye pipe? A link to the site that has it.?

Answer 1

Are we talking about plumbing here? Cause I have never heard of a 1/2" wye. 1/2" "T" yes. A wye would be used for venting and draining so 1/2" isn't going to cut it and wouldn't exist. Minimum size would be 1 1/2".