The 6" Ames 2000SE Silver Bullet Series Double Check Valve Assemblies began production in 1998 but was discontinued in 2006. They are all stainless steel body devices. Please be sure which model you have as the "SS" and "SE" models use different repair parts. They utilize a single victaulic cover with two self contained plastic cam checks that thread into the body. There are no rubber repair kits available for the 2000SE models, only complete cam checks. Although specialty tools are not required for servicing the device, there is a handy cam check tool available, designed to save time and prevent damage to the cam checks.