The highly absorbent

10 self-tapping screws are required and are not included from the manufacturer

Specialty shop vacuums are used in specific applications

They also feature verticle flutes

Mid-West Instrument Backflow Preventer Test Kit, 5 Valve, Includes: (3) 5ft Hoses, Analog test Gauge, Carrying Case, Cer - 830 Width-11" The highly absorbentFor testing reduced pressure principle, pressure vacuum breaker and double check valve backflow prevention assemblies. Features soft seated brass needle valves with replaceable valve seats and cleanable 90 micron filters that reduce plugging with scale, sand, and other contaminants. Capable of performing all known test procedures including those recommended by ASSE, AWWA, FCCC, HR USC, and NEWWA. Includes 3 sets of brass fittings for hookup to all