ID - Inside Diameter. Diameter measurement from the inside of a pipe. Commonly used for sizing pipe.
IPS - Iron Pipe Size (OD). Same as NPS. Standard pipe threads. Also Internal Pipe Swivel connection (female).
ISO - International\ Organization for Standardization based in Geneva Switzerland. Among the many standards it issues are pump and seal standards for the metric community.
ISO 9000 - A series of five standards for developing a total quality management system. Developed by the International\ Organization for Standardization.
Impeller - Rotating wheel with vanes found inside a centrifugal pump. As it spins at high speed it draws fluids in and thrusts them under pressure to the discharge outlet.
Incomplete Combustion - A product of inadequate ventilation which restricts the flow of air into an appliance. This may lower oxygen content in the surrounding air.
Incoming Inlet Temperature - Temperature of water entering the tank
Indirect Wastes Pipe - Waste pipe used to convey gray water by discharging it into a plumbing fixture such as a floor drain.
Induction Motor - The most common type used in industry. Has a slippage of 2 to 5 percent compared to synchronous motors.
Influent - The stream entering a unit, stream or process, such as the hard water entering an ion exchange water softener.
Injection - The drawing of primary air into a gas burner by means of a flow of fuel gas.
Inlet - An entrance, opening, or aperture for the intake of fluid or gas.
In-line Pump - Small pump which pumps fluid through a line on which it is supported and mounted.
Input - The amount of fuel used by a water heater in a given period of time, usually 1 hr.
Input Rate - The quantity of heat or fuel supplied to an appliance, expressed in volume of heat units per volume of time (BTUs/hour).
Input Rating - The gas burning capacity of an appliance in BTU's per hour as specified by the manufacturer.
Insanitary - So unclean as to be a likely cause of disease; Contrary to sanitary principles injurious to health.
Inserts - Faucet handles
Insert Fittings - Fittings equipped with external, annular rings fir gripping, which are inserted into flexible rubber or plastic tubing as a connection.
Island Vent - An air admittance valve
Isolation Mount - The four small rubber feet located beneath a whirlpool's pump base, or attached to the pulse canister assemblies, designed to reduce noise and vibration when the whirlpool is running.
Instantaneous Water Heater - A type of water heater that heats water as it flows through a heat exchanger coil.
Insular ? - Kohler's registered trade name for factory-installed insulation, which minimizes condensation on the outside of the tank when exposed to high humidity.
Insuliner ? - Kohler's Registered trade name for factory-installed tank insulation, which minimizes condensation on the outside of the tank (also known as tank sweating) when exposed to high humidity.
Integral Stops - Stops that allow the owner to shut off water supply at the faucet for maintenance without shutting off the water supply to the entire house.
Integral Vacuum Breaker - A device typically used in a sink or shower sprayer to keep water from backflowing into the fresh water supply.
Interceptor - Device for separating grease and oil from drainage system. See grease trap.
Isothermal - Action that takes place with no change in temperature.
Source: "Plumbing Terms" Standard Plumbing Supply. 11 Sept. 2008
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