The 3" Ames 5000SS Series Reduced Pressure Detector Assembly (RPDA) backflow preventer began production in 1991 and is still currently in production. The body is contructed of stainless steel and uses a single victaulic coupler cover. The 5000SS utilizes plastic cam checks and a self contained stainless steel relief valve. The relief valve may be removed from the body by unthreading it, but use caution when doing so, as to not "squeeze" or warp the RV body. The cam checks thread into the body. Although not necessary, a cam check removal tool is available to remove the check assemblies for the 2 1/2 - 6" sizes. Bypass valves changed multiple times over the years and include 3/4" Conbraco 40-200, 3/4" Ames 4000SS, 3/4" Ames 4000B, and 3/4" Ames 4000B-M3.