In a June article, “New avenues,” Dan Worm’s certification was misidentified. Worm is a certified plumbing designer (CPD). “ASTM-F1960” should have referred to Uponor’s ProPEX Fitting System, not its piping. Also, Uponor manufactures only crosslinked polyethylene (PEX) pipe, not polypropylene pipe. Worm’s quote should have read, “All the codebooks and tables are based off copper, so engineers get used to those numbers.”