2000SS/3000SS
These models do not have replaceable rubber kits. It is complete checks for sizes 2 1/2" - 6" The 8" - 12" do have rubbers that come out and can be cleaned but they do not make a kit with the rubbers at this point.
The 2 1/2", 3" and 4" are the same kit.
6" kits are just for that size.
8", 10" and 12" are the same kit.
2000SE/3000SE KITS
These models use the same parts as the 2000SS/3000SS but a size smaller. For example if you have a 6" SE model it uses the 4" SS parts. The 8" SE model uses the 6" SS parts.
Ames technically has a model number for these but they are the same parts. Listed on this page are some of those part numbers but they may not be in stock. Know you can use the 2000SS/3000SS parts.
If you have questions about this call us at 801-355-6736 or email Sean at sean@backflow-supply.com