Wall thickness does not affect pipe or tubing size. 1/2" L copper has the same outer diameter as 1/2" K or M copper. The same applies to pipe schedules. As a result, a slight increase in pressure losses is realized due to a decrease in flowpath as wall thickness is increased. In other words, 1 foot of 1/2" L copper has slightly less volume than 1 foot of 1/2 M copper.
I want to thank Technician Sean D. and his associate Paul C. for during an outstanding job replacing some of my plumbing. They arrived on job site at the time promised and quickly determined my problem. They were both very friendly and professional. Sean was very knowledgeable as to what had to be done and made a good job an excellent job with a few tweaks. Atomic Plumbing is lucky to have employees of this caliber.