| Air Relief
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On top of a filter, to release air in the filter tank.
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| Bulkhead
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Attachment that holds pipes entering and exiting a filter tank.
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| Burner tray
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Assembly of gas heater burners, pilot, gas valve and gas manifold.
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| Cap
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A cap fits over a pipe, and can be threaded or slip. Opposite of a Plug.
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| Capacitor
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Stores energy, like a battery. Used to start electric motors.
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| Clamp
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Belly band filter clamps, MPV clamps or radiator hose clamps
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| Compression fitting
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A fitting used to join pipe or hose together, with a outer compression nut and inner compression ring.
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| Coupling
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A connector or junction, used to couple or join two pieces of pipe or hose.
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| Diffuser
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A perforated device to spread out or diffuse water as it enters a sand filter.
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| Debris Bag
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Pool cleaner bag that holds vacuumed debris.
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| Dome
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Lid for sand filter with a side mount valve.
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| Elbow
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A 90 degree fitting, or a 45 degree fitting used in plumbing or electrical wiring.
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| Element
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An electric heater element, or a cartridge filter element.
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| Escutcheon plates
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Beauty rings used to cover ladder and handrail anchor sockets.
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| Ferrule
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The internal compression ring used in a compression fitting.
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| Filter media
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The material used to filter your water. Diatomaceous Earth, Spun Polyster or #20 silica sand.
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| Foot
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The base of a pool filter or pool pump.
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| Gas valve
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The internal gas valve that sends propane or natural gas to the pilot and burners.
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| Gasket
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A mechanical seal in a flat shape. Usually made of paper, rubber, or cork.
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| Grid
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For DE pool filters, a grid is a plastic frame covered in a polyester fabric.
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| Header
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Front and rear manifolds used on pool heaters to direct water through the heat exchanger.
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| Heat exchanger
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A set of 8-10 copper or titanium finned tubes which absorb heat from the burner tray.
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| Hose
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Backwash hose, Vacuum hose, Aboveground filter hose, Pool cleaner feed hose.
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| Hose adapter
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A fitting that is threaded on one end, and tapered on the opposite end to insert into a hose.
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| Hose nut
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Used on pressure pool cleaners to join together sections of feed hose.
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| Lateral
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Slotted plastic pipes in a sand filter, to strain out filtered water from the sand.
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| Lid
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Top access for pumps baskets, clam-shell type filters or chlorinators.
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| Manifold
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Directs water in specific directions. DE filters use a manifold on top of the grid assembly.
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| Module
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The controller for an electronic pool heater. Also called an IID (intermittant ignition device).
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| Nipple
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A short section of pipe, threaded on one or both ends.
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| O-ring
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Ring of certain size, formed of a specific diameter of round rubber cord, seals pressurized equipment.
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| Pilot
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Older millivolt heaters have a constant pilot light, Newer heaters light a pilot only when needed.
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| Plug
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A plug fits inside of a pipe or hole, and is either threaded, slip or expandable.
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| Quick disconnect
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A type of connector shell that permits rapid locking and unlocking connector halves.
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| Reducer
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A coupling with different pipe size connections on either end, reducing the pipe size.
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| Reducer Bushing
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Insert reducer, threaded or slip, glues inside of a fitting to reduce connecting pipe diameter.
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| Rotor
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The footpad inside of a multiport valve, which rotates to create different flow directions.
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| Saddle clamp
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A curved assembly that clamps to a pipe, to hold a flow meter or injection fitting.
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| Seal
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Mechanical shaft seals behind a pump’s impeller to prevent water leakage along the shaft.
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| Seal plate
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The plate that connects to the motor and to the volute, and holds half of the shaft seal.
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| Set screw
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A small hex head screw used to hold a stub shaft onto a keyed shaft motor.
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| Spider gasket
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Square cut rubber with a wagon wheel appearance, for sealing multiport valve ports.
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| Standpipe
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The vertical pipe within a pool filter, which carries out of the filter.
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| street elbow
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A 90 degree fitting which has one side threaded or smooth for slip insert.
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| Tee
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A three port fitting, in the shape of the letter T with many uses.
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| Terminal board
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Wires connect to a terminal board, for motors, timeclocks and controllers.
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| Throttling plug
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Small threaded plug with slots. Used to reduce flow from skimmers close to the pump.
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| Transformer
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Used for pool heaters, low voltage lights, and robotic pool cleaners. Reduces incoming voltage.
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| Tread
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Ladder treads, used on pool slides, or for entering or exiting a pool.
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| Union
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A coupling with an internal o-ring, and a nut to tighten. Makes future removal easy.
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| Volute
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The impeller housing of a pool pump. The shape creates vacuum and pressure.
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| Weir
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That flapper door thingy in the skimmer.
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