Kraissl Co. was the first to develop duplex 3-way (6-port) transfer valves with standardized port connections for external equipment. These tapered plug-type models were adapted from Kraissl's duplex strainer designs. Read More
Mission The mission of A.Y. McDonald Mfg. Co., in the words of our founder, is “to make good products and sell them honestly.” We, the stockholders and employees, accomplish this by extending the McDonald family culture through excellent customer service and by focusing on our customers’... Read More
