The Wilkins 350ADA is a double check detector assembly (DCDA). It is available in 2 1/2″-10″ sizes and has been in production since 2004. The body is made of epoxy coated cast iron. The 350ADA utilizes a 3/4″ 950XLD for the bypass assembly. Parts between the 350DA, 350ADA, and 350ASTDA are not interchangeable.