The Wilkins 350/350A is a double check valve assembly ( DCA ). It is available in 2 ½” – 12” sizes and has been in production since 1998. The “A” series began in 2004 and indicates that the inlet and outlet of device body are grooved instead of flanged. Parts are interchangeable between the 350 and 350A series except on 2 ½” – 3” sizes where the repair parts are different. The 12” 350 has been in production since 2007. The body is made of ductile iron with a fused epoxy coating. A lead free version was introduced in 2011 (XL).
American Backflow Products Company