Plumbing Terminology - R

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Reducer

A reducer is the component in a pipeline that reduces the pipe size from a larger to a smaller bore (inner diameter). The length of the reduction is usually equal to the average of the larger and smaller pipe diameters. A reducer can be used either as nozzle or as a diffuser, depending on the mach number of the pipe that is used to direct the flow.

Rim Holes

Rim holes are 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.

Rim Holes

With rim holes are meant the series of small holes underneath the toilet rim, around the circumference of the bowl. The incoming water flows down into the toiletbowl through these holes and creates the rinsing effect to make it wash over the entire inner surface of the toilet bowl.

Riser

Risers are vertical metal or plastic tubes or assemblies 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.

Rough Plumbing

Rough Plumbing is a term used in the plumbing and contruction industry to point to a stage in construction when the plumbing is actually roughed in before the walls are covered up with sheet rock or other wall finishes.