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Packing - Fibrous material that is used on faucets to prevent leaks.
Packing Nut - Nut that holds the stem of a faucet in position & holds the packing material.
Peak Hour Demand - Time when the largest demand for hot water is needed.
Petcock - A valve device put on water lines for drainage purposes. Frequently found on swamp coolers, refrigerator water lines, etc.
Pipe Dope - Slang for pipe-joint compound. Substance applied to threaded fittings to create a watertight seal.
Pitch - Downward slope of a drain pipe in the direction of the water flow.
Plumb - Precisely vertical. Also to test for, or to make vertical. Also to perform plumbing work.
Plumber's Putty - Pliable, popular putty used to seal joints between drain pieces and fixture surfaces.
Plumbing Tree - Prefabricated set of drain waste, vent, and supply lines.
Pop-Up Drain - Type of drain assembly for lavatory and bath. When a lavatory lift rod or bath overflow plate lever is lifted, the pop-up drain closes so the lavatory or tub retains water.
Port - An opening in a burner head through which gas or an air-gas mixture is discharged for ignition.
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.
Pressure Balance Valve - Shower mixing valve that automatically maintains balance between incoming hot and cold water supplies by immediately regulating fluctuations in pressure. As a result, temperature remains constant, though the outlet pressure may drop. Also known as an anti-scald valve.
Pressure Tank - Device used to pump water from a well.
Pressure Tubing - Tubing used to conduct fluids under pressure or at elevated temperatures or both, and produced to stricter tolerances than pipe.
PVC - Polyvinyl chloride. A rigid white or cream-colored plastic pipe used in non-pressure systems, such as drainage, waste, and vent systems.
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