The Ames Colt series C-200, C-300 Double Check Valve Assemblies began production in 2000 under the Hunter name. In 2002, Ames bought the rights off of Hunter and is still manufacturing the devices. They are available in sizes 2 1/2 - 10" and are constructed of stainless steel. The Colt Series has become a top seller of Ames due to the light weight design and short lay lengths. It is also offered in a number of configurations with many valve options. To access the check assemblies there is a stainless steel sleeve that will slide open. On the 2 1/2 - 6" you must unthread the #3 test cock then slide the cover. 8 - 10" uses two Victaulic clamps to hold the stainless sleeve. The Colt uses two self contained cam checks that use a tri-link check mechanism. Numerous repair parts are available for the Colt series devices, including rubber parts and complete parts. The C-200 is the normal Double Check Assembly, while the C-300 is the Double Check Detector Assembly (equipped with bypass assembly). There are no special tools required for service.