Mid-West Instrument Backflow prevention assembly test kit includes 5 valve. The 835 is in the list of acceptable gages from both FCCC and HR-USC and CA-NV AWWA. Backflow test kits provide the capability for testing all brands of reduced pressure principle, pressure vacuum breaker, spill resistant vacuum breaker and double check valve backflow prevention assemblies. Over 30 years of input from Backflow technicians. Specially designed for testing backflow prevention assemblies. Soft-seated brass needle valves (with replaceable valve seats). Test kit is protected with 90 micron filters to minimize plugging with scale, sand, etc. Filter elements can be cleaned or replaced. Improved case with storage compartments for fittings and tools. Test procedures are laminated in clear plastic. 5 Year warranty. Gauge type diaphragm differential pressure. Dial size and range (4-1/2-inches) 0-15 psid/0-100 KPA. Differential pressure accuracy +/-0.2 P.S.I.D. (Descending). Working pressure: 200 psig. Body material: glass reinforced engineering thermoplastic. Wetted internals: EP elastomers, brass and 316 stainless steel metal parts. Line pressure gauge: 1-1/2-inches 0-200 psig. Hoses and end fittings: Buna-N jacket and liner. Schrader 1/4-inches brass coupler. Hose length: three (3) each/5-feet long (color-coded). Bleed tube, one each/4-feet long clear bleed tube. Adaptor fittings: (3) sets of brass fittings provided for hookup to all standard size test cocks. Temperature limitations: maximum 150 degree F/65 degree C. Measures 18-1/2-inches length by 9-inches width by 9-3/4-inches height. Freezing temperatures must be avoided.