| Closet Supply | Industry term for toilet water supply products. Sold as each opposed to in pairs with lavatory supply kits. |
| DWV | Drainage Waste Vents. |
| EPDM | Ethylene Propylene Dien Monomer used on washers to prevent degradation when the product is exposed to chlorine, chloramines and high water temperatures. |
| Female | Pipes, valves, or fittings with internal threads. |
| Fixture | Products which receive water at points of usage; i.e. sinks, toilets, tubs, etc. |
| ID | Inside diameter. |
| IPS | Iron pipe size. |
| Lavatory Supply | Industry term for bathroom or washroom sink. |
| Male | Pipes, valves, or fittings with external threads. |
| OD | Outside diameter. |
| Pop-Up Drain | Remote control drain assembly (most commonly used with lavatories and bathtubs). |
| Potable | Water which is safe to drink. |
| Repair Trap | Special trap design which provides slip joint connections at both ends. |
| Slip Joint | A telescoping means of connecting in which a gasket is compressed around the perimeter of the inside member. |
| Stop | A valve used to shut off water to a specific fitting, fixture or pipe line. |
| Stuffing Box | Used for additional leak protection on stops. |
| Sweat Connections | Term often used interchangeably with soldering. |
| Trap | Plumbing fittings that are required under all plumbing fixtures; traps have a built in water level that prevents sewer gas from coming into the house. Toilets are the only fixtures that have their own built-in trap. |
| Vent | Pipe that carries away sewer gasses and odors; also lets air into the line, letting the pipes drain. |