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A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
Unsolved Mysteries is an American mystery documentary television series, created by John Cosgrove and Terry Dunn Meurer. Documenting cold cases and paranormal phenomena, it began as a series of seven specials, presented by Raymond Burr, Karl Malden, and Robert Stack, beginning on NBC on January 20, 1987, becoming a full-fledged series on October 5, 1988, hosted by Stack.
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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.
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In 1978, competing in-tank toilet cleaner 2000 Flushes was launched, initially as a jar of chlorine bleach crystals for the toilet tank. In 1987, Sara Lee Household and Body Care purchased the Ty-D-Bol brand from near-bankrupt Papercraft Holdings, [ 6 ] operating it as part of its Kiwi Brands division in Douglassville, Pennsylvania . [ 7 ]
Flashback arrestors with different size and flow rate, and different connections. A flashback arrestor or flash arrestor is a gas safety device most commonly used in oxy-fuel welding and cutting to stop the flame or reverse flow of gas back up into the equipment or supply line. It protects the user and equipment from damage or explosions.
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