| R & D |
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Reamed and Drifted. Pipe commonly used in water wells having a special, heavy-duty coupling and a guaranteed I.D. clearance. |
| RF |
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Recovery Factor - Rating based on the efficiency of the product which is input required to raise 1 gallon of water 1 degree Fahrenheit. |
| Rail Fittings |
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Fittings with setscrews rather than threads, which hold pipes used for hand railings. Available in various sizes and configurations to suit a number of applications. Not used for plumbing or conduit. |
Rated Storage Volume |
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Volume Quantity of water stored in a tank. |
| Raw Water |
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Water supplied to the plant before any treatment. |
| Reamer |
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A grinding tool used to level or remove burrs from valve seats in faucets so that the valve stem will fit properly. |
| Recessed Tub |
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A tub that has a decorative finish on one side only, and surrounded by three walls. The apron, or skirting, may not be included and must be ordered separately. The most popular style. |
| Recirculating Harness |
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PVC tubing setup that circulates water throughout a whirlpool system, delivering water to the jets. |
| Recovery |
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The amount of water in gallons that can be heated in one hour. (gph). |
| Recovery Capacity |
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The amount of water in gallons per hour raised 100 degrees F at a given thermal efficiency and BTU per hour input. |
| Red Water |
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Water which has a reddish or brownish appearance due to the presence of precipitated iron and/or iron bacteria. |
| Reducer |
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A pipe fitting used for joining pipes with different diameters together. A bushing is threaded on both the inside and outside. |
| Reed Switch |
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A serviceable, magnetic sensing switch that triggers the water flow to stop when the neck jet pillow (with magnet) is removed from the whirlpool. |
| Refill Tube |
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The tube that directs water from a ballcock into the overflow tube to refill the bowl after a siphon break. |
| Reflective Glass |
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Glass that bounces back at least some of the light that strikes it. |
| Relief Valve |
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A valve that opens to relieve excess temperature. |
| Repair Clamp |
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Sleeve type clamp used to repair a split pipe, held in place by bolts. |
| Return Circulation System |
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Tempered water from or near the point of usage which eliminates waste of hot water used for long runs and adds storage to the system. |
| Revent |
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Pipe installed specifically to vent a fixture trap. Connects with the vent system above the fixture. |
| Reverse Osmosis |
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A water treatment method whereby water is forced through a semi permeable membrane which filters out impurities. |
| Reverse Trap Water Closet |
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A water closet having a siphonic trapway at the rear of the bowl, and integral flushing rim and jet. Min. dimensions are 9" x 8" water spot and 1 ½" ball pass. |
| Rich Mixture |
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A mixture of gas and air containing too much fuel or too little air for complete combustion of the gas. |
| Rigid Pipe |
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Pipe designed to transmit the backfill load to the foundation beneath the pipe. Rigid pipe must be supported on the bottom portion of the pipe. |
| Rim |
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The inside edge of a toilet bowl or the edge of a lavatory or sink. |
| Rim Holes |
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A series of small holes in the underside of a toilet rim, around the circumference of the bowl. Incoming water flows down into the bowl through these holes, creating a rinse effect or wash over the entire inner surface of the bowl. |
| Riser |
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A vertical metal or plastic tube or assembly that connects a faucet to the water supply stop valve. Usually made of copper. Metal Flex Risers are corrugated to facilitate bending. Also a supply line that rises from one story to the next. |
| Roller Hanger |
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A pipe hanger similar to a clevis hanger except that the yoke bolts to a roller rod instead of a metal strap. This roller rod supports the pipe and permits horizontal movement. |
| Roman Spout |
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Deck-mounted faucet spout. |
| Roof Drain |
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A drain installed at the low spot in a roof that channels water into a drainpipe to prevent pooling. |
| Roof Flashing |
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Sheet metal installed at any break in a shingled roofline to prevent leaks. Also around sewer vents, fluepipes. |
| Root Valve |
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A multi-port valve commonly used on gauges or switches in high pressure, high temperature, or under otherwise severe process conditions. Typically built with non-rotating and non-threaded stems. |
| Rough-In |
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Installation of the drain, waste, vent, and supply lines in a structure to the proposed location of each fixture. |
| Rough-In Dimensions |
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Standard shape of the front of a toilet bow, having dimensions of 14" wide by 16 ½" long from center of seat hinge holes to front outside rim edge. |
| Round Front Bowl |
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Standard shape of the front of a toilet bow, having dimensions of 14" wide by 16 ½" long from center of seat hinge holes to front outside rim edge. |
| Run |
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A complete or secondary section of pipe that extends from supply to fixture or drain to stack. |
| Running Trap |
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An in-line trap mounted in a horizontal drainpipe, where the inlet and outlet are parallel. |
