Bathroom shopping comes with a vocabulary of its own. A single faucet listing can mention aerators, valves, finishes and mounting types before it gets to the price, and the terms are not always explained. This glossary collects the words readers of Bathroom Accessories World meet most often.
The definitions are short and neutral. They describe what a term usually means across the industry, and a specific manufacturer may use a word slightly differently. When a measurement or compatibility detail matters, check the product’s own specifications. See our FAQ for questions about the site itself.
- Aerator
- A small screen at the tip of a faucet that mixes air into the water stream. It can reduce splashing and lower the flow rate. Most aerators unscrew for cleaning or replacement.
- Backsplash
- A short vertical panel along the back edge of a vanity top. It protects the wall from water and soap. Some vanity tops come with one built in, and others are sold without.
- Brushed nickel
- A finish with a soft, satin-gray look created by brushing the metal surface. It tends to hide fingerprints and water spots better than polished finishes. Nickel finishes can differ slightly between brands.
- Cartridge
- The internal part of a faucet that controls water flow and temperature. When a faucet drips, the cartridge is often the first part replaced. Cartridges are usually specific to a brand and model.
- Centerset faucet
- A faucet with the spout and two handles joined on a single base. It fits sinks with three holes drilled four inches apart. It is a common choice for standard vanities.
- Chrome
- A bright, reflective finish applied over metal in a thin plating layer. It is widely available and generally easy to wipe clean. It can show water spots and fingerprints.
- Escutcheon
- A decorative plate that covers the opening where a pipe or fixture stem passes through a wall or sink. It hides rough edges around the hole. You will see it on shower valves and tub spouts.
- Flange
- A rim or collar used to connect, support or seal a part. In bathrooms, the term appears on drains and toilet installations. The flange helps hold the part in position and keep water where it belongs.
- GPM
- Gallons per minute, the standard unit for how much water a faucet or showerhead uses. A lower number means less water used. U.S. rules set maximum flow rates for many fixtures.
- Grab bar
- A sturdy horizontal, vertical or angled bar mounted on a wall for support near a tub, shower or toilet. It must be anchored into solid framing or with rated anchors. Weight ratings vary by product.
- Matte black
- A dark, non-reflective finish that has become popular for faucets, towel bars and hooks. It hides water spots well. Durability depends on the coating the manufacturer uses.
- Mounting hardware
- The screws, anchors, brackets and washers used to attach an accessory to a wall or surface. Some products include it, and others do not. Wall type decides which anchors will hold properly.
- Overflow
- An opening near the top of a sink or tub that drains water away if the basin is filled too high. It prevents spills over the edge. It connects to the drain pipe below.
- P-trap
- The curved section of drain pipe under a sink that holds a small amount of water. That water blocks sewer gases from rising into the room. It also catches items that fall down the drain.
- Pop-up drain
- A sink drain with a stopper that rises and drops, usually operated by a lever or by pressing the stopper. It lets you hold water in the basin. Many faucets are sold with one included.
- Rough-in
- The stage of installation where pipes and drains are placed inside the wall or floor before fixtures go on. The rough-in dimensions determine which fixtures will fit. Toilets and shower valves both depend on them.
- Shut-off valve
- A small valve on a supply line that stops water to a single fixture. It lets you repair or replace a faucet without turning off the whole house. It is also called a stop valve.
- Spread
- The distance between the outer holes on a sink for a widespread faucet, measured from center to center. Common spreads are eight inches. The faucet you choose must match the spread of the sink.
- Supply line
- A flexible or rigid tube that carries water from the shut-off valve to the faucet. Braided stainless steel and plastic are common materials. Length and connector size must match the fixture.
- Thermostatic valve
- A shower valve that holds the water temperature steady by mixing hot and cold water. It reduces sudden changes if another fixture is used. It is more complex than a basic pressure-balance valve.
- Towel bar
- A horizontal rod, usually mounted on the wall with two brackets, for hanging towels. Lengths are commonly given in inches. Wall anchors matter when it holds wet towels.
- Undermount sink
- A sink mounted beneath the countertop so that the counter edge overlaps the basin. It leaves no rim to collect grime. It needs a solid-surface countertop that can be cut for it.
- Vanity
- A cabinet that holds the bathroom sink and provides storage. Vanities come in many widths and may be sold with or without a top and sink. Measure the available wall space before choosing one.
- Vessel sink
- A basin that sits on top of the counter instead of being set into it. It usually calls for a taller faucet. Its height changes how comfortable it is to use.
- Widespread faucet
- A faucet whose spout and two handles are separate pieces that fit into three holes. The holes are usually eight inches apart. It gives more flexibility in layout than a centerset model.