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2. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

3. Officials were warned of failing water system before ... - AOL

   www.aol.com/news/officials-were-warned-failing...

   L.A. County officials have planned for years to replace the structure with a larger tank, but construction has yet to begin. ... Mom and son fought off Palisades fire with pump, hose and pool water.

4. Reduced pressure zone device - Wikipedia

   en.wikipedia.org/wiki/Reduced_pressure_zone_device

   This gauge uses hoses attached to the various test cocks of the RPZD and checks to be certain that the check valve springs as well as the relief valve spring are not fouled and are working properly. There is a variety of manufacturers of these gauges, but most utilize either a three-valve or a five-valve design to test the RPZD in different ways.

5. Automated pool cleaner - Wikipedia

   en.wikipedia.org/wiki/Automated_pool_cleaner

   This type of cleaner is usually attached via a 1.5-inch hose to a vacuum plate in the skimmer, or a dedicated extraction or "vac" line on the side of the pool. The suction action of the pool's pump provides the needed force for the machine to randomly traverse the floor and walls of the pool, extracting dirt and debris in its path.

6. Hard suction hose - Wikipedia

   en.wikipedia.org/wiki/Hard_suction_hose

   Flexible suction hose, also known as a suction hose, is a specific type of rigid fire hose used in drafting operations. When using this technique, the fire engine draws water for fire fighting from an unpressurized supply, such as a portable water tank, pool, or other static water source, instead of drawing water from a pressurized water supply, such as a fire hydrant.

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