A.Y. McDonald Mfg. Co. is a leading manufacturer of water works, plumbing, pumps, and natural gas products. The company has distinguished itself with exceptional customer service and a proud tradition of quality and reliability since the year 1856. Our corporate headquarters, brass foundry, and main manufacturing plant are located in Dubuque, IA. Customers choose A.Y. McDonald Mfg. Co. over the competition because the customer is ‘the boss’ and every effort is exerted to exceed expectations, customer service is the number one priority and customers find quality products linked with outstanding people