The Watts 757NDCDA is a double check detector assembly (DCDA). It is available in 2 1/2″-10″ sizes and has been in production since 2002. The body is made of stainless steel. The 757NDCDA utilizes a 3/4″ 007M3 for the bypass assembly. A lead free version was introduced in 2014. The 757NDCDA is a Watts private label of the Ames C300.