The Ames C300N is a double check detector assembly (DCDA). It is available in 2 1/2″-10″ sizes and has been in production since 2000. The body is made of stainless steel. The C300N utilizes a 3/4″ 2000BM3 for the bypass assembly. A lead free version (LFC300N) was introduced in 2014. The Watts 757NDCDA is a private label of the C300N.