The Wilkins 350DA is a double check detector assembly (DCDA). It is available in 2 1/2″-12″ sizes and has been in production since 1998. The body is made of epoxy coated cast iron. The 350DA utilizes a 3/4″ 950XLD for the bypass assembly. Parts between the 350DA, 350ADA, and 350ASTDA are not interchangeable.