The Watts 774XDCDA is a double check detector assembly (DCDA). It was available in 6″-8″ sizes and was produced from 1998-2006. The body was made of stainless steel. The 774XDCDA utilizes a 3/4″ 007M3 for the bypass assembly. The 774XDCDA was a Watts private label of the Ames 3000SE.