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, (3) adapters, 1 securing strap, and an instruction guide. The TK-9A 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: 175 psi (12.06 bar).