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Rated Storage Volume - Quantity of water stored in a tank.
Reamer - A grinding tool used to level or remove burrs from valve seats in faucets so that the valve stem will fit properly.
Recovery Capacity - The amount of water in gallons per hour raised 100 degrees F at a given thermal efficiency and BTU per hour input.
Reducer - A fitting that connects pipes of different sizes together.
Return Circulation System - 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 - Pipe installed specifically to vent a fixture trap. Connects with the vent system above the fixture.
Reverse Trap Water Closet - A water closet having a siphonic trapway at the rear of the bowl, and integral flushing rim and jet.
Rigid Pipe - 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 Holes - 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 - 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.
Roof Flashing - Sheet metal installed at any break in a shingled roofline to prevent leaks. Also around sewer vents, fluepipes.
Rough-In - Installation of the drain, waste, vent, and supply lines in a structure to the proposed location of each fixture.
Rough-In Dimensions - The distance from a finished wall or floor to the center of the waste or supply opening or mounting holes on a plumbing fixture.
Run - A complete or secondary section of pipe that extends from supply to fixture or drain to stack.
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