The Ames 5000SS is a reduced pressure detector assembly (RPDA). It is available in 2 1/2″-6″ sizes and has been in production since 1990. The body is made of stainless steel. The 5000SS has used multiple devices for the bypass assembly. It currently utilizes a 3/4″ 4000B for the bypass assembly. The Watts 994RPDA is a private label of the 5000SS.