CHARLOTTE PIPE AND FOUNDRY COMPANY This is to certify that all Plastic Pipe and Fittings manufactured by Charlotte Pipe and Foundry Company are manufactured in the United States and conform to the following standards: PYC SCH. 40 SOLID WALL PIPE MAST D 1784, MAST D 1785, MAST D 2665 FHA UM 79a FEDERAL SPECIFICATION L-P-320a NSF STANDARD NO. 44 AND 51 PYC SCH. 40 DWV CELLULAR CORE PIPE MAST D 4396, MAST F 851 NSF STANDARD NO. 14 PYC SCH.