Charlotte Pipe has a new cast-iron plumbing system for aggressive DWV applications — Edge HP Iron. The high-performance pipe and fittings are specially coated for applications that may need enhanced protection, such as hospitals, commercial kitchens and casinos. The full line includes 2” through 15” NH and SV pipe in 10’ lengths, and more than 560 SKUs of 2” through 15” NH, SV and XH fittings.