Model TK-9A Backflow Preventer Test Kit is a compact portable device made for testing all reduced pressure zone backflow prevention assemblies and double check valve assemblies. It consists of a gauge, test valves, 3 hoses with female-threaded swivel couplings, three adapters, 1 securing strap, and an instruction guide. It is easily connected to any RPZ device enabling accurate testing of zone differential pressure, relief valve opening differential, fouled check valves or similar problems that visual inspections cannot locate. Includes a carrying case for easy handling and accessibility. Maximum working pressure is 175psi (12.06 bar).