The Watts 757ADCDA is a double check detector assembly (DCDA). It was available in 2 1/2″-6″ sizes and was produced from 2002-2008. The body was made of stainless steel. The 757ADCDA utilized a 3/4″ 007M3 for the bypass assembly. The 757ADCDA is a Watts private label of the Ames C300A.