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There are 15 entries in the glossary.| Pages: 1 |
| 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. |
| 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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