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Learn about Plumbing - Paul McElrath - About Shower Heads Wave Washer ~ A washer, common in drain linkages, which provides pressure against a ball or other mechanism even when the opposing nut is not fully tightened Porcelain Enamel ~ Vitreous enamel. Often refers to pressed steel products with a porcelain glaze. Phenol ~ A poisonous and carcinogenic chemical often found in municipal water supplies. Also known as carbolic acid, phenol is a benzene derivative Stand Pipe ~ Open vertical pipe that receives water from a washing machine. Also the vertical pipe run supplying water to a fire sprinkler system; also large vertical pipe into which water is pumped in order to produce a desired pressure; a high vertical pipe or reservoir that is used to secure a uniform pressure in a water-supply system Paul McElrath - Install PEX Positive displacement pump ~ Called a PD pump. Gear, sliding vane, progressive cavity, lobe etc. the capacity determined by the pump speed. The maximum head is determined by the horsepower available and the casing strength. Hardness Leakage ~ The presence of a consistent concentration of hardness in the effluent from an ion exchange water softener, often due to high concentrations of hardness or sodium in the water being treated (see Leakage). Working Water ~ Water used in a home for most general purposes including bathing and laundering Manifolded Installation ~ Paralleling of water heaters for large hot water demand applications. Paul McElrath - Fitting : Air Gap ~ A device mounted at the back of a kitchen sink, connecting to the drain line between a dishwasher and disposer to allow the dishwasher to discharge freely into the disposer while preventing contaminated water from siphoning back into the dishwasher. Can be any unobstructed vertical opening between the lowest opening of a waste line and the flood level of the device into which it empties to relieve pressure and prevent backflow contamination More related websites: Paul McElrath - About Plumbing Paul McElrath - About Shower Heads Paul McElrath - Water Heater Paul McElrath - Steel Piping Paul McElrath - Steam Piping Paul McElrath - About Plumbing Tools Paul McElrath - Plumbing Repair Paul McElrath - ABS Pipe