The Wilkins 375ASTDA is a reduced pressure detector assembly (RPDA). It is available in 2 1/2″-10″ sizes and has been in production since 2011. The body is made of stainless steel. The 375ASTDA utilizes a 3/4″ 975XLD for the bypass assembly. Parts are not interchangeable between the 375DA/375ADA and the 375ASTDA.