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L Tubing:
An industry standard for copper tubing defined by the tube wall thickness and identified by a "blue" strip. Type "L" copper tube wall is approximately 50 percent greater thickness than type "M".


Laminar Flow:
Streamline flow in a fluid near a solid boundary.


Laminated Glass:
Glass that has been made by uniting layers of glass in order to strengthen the glass.


Langelier's Index:
A calculated number used to predict whether or not water will precipitate, be in equilibrium with, or dissolve calcium carbonate. It is sometimes erroneously assumed that any water that tends to dissolve calcium carbonate is automatically corrosive.


Lateral Sewage Line:
A sewage line that connects one sewage pipe with another.


Laundry Tub:
Very deep sink used in a laundry room for soaking or washing clothing.


Laundry Tray:
Laundry tub. Very deep sink used in a laundry room for soaking or washing clothing.


Lav:
Lavatory


Lav Tube:
Water supply tube for lavatory.


Lavatory:
Bathroom or washroom sink.


Lavatory Faucet:
Type of faucet designed to deliver water into a lavatory.


Lavatory Riser:
Flexible supply tube with bullet-shaped end, used to make the final supply connection with external threaded inlet shanks (MIP).


LDO:
Lint, Dust, and Oil.


Leach Field:
Porous soil area, through which septic tank leach line run, emptying the treated waste.


Leach Lines:
Pipes that carry effluent from the septic system out to the leach field.


Lead:
A heavy metal that is hazardous and can be found in drinking water as a result of corroded pipes. Ingestion of lead has been known to cause brain damage.


Leader:
Pipe carrying rainwater to the ground or sewer.


Ledgeback:
Style of sink or lavatory which includes a deck at the rear for mounting the faucet and other accessories.


Lean Mixture:
An air-gas mixture that contains more air than needed for complete combustion of the gas.


Length:
A unit of linear measure for pipes, such as 10 or 20 feet.


LH:
Left Hand.


Lid:
Toilet tank lid. The removable top cover on a toilet's tank.


Lift Cycle Labs:
A place where water heaters are tested at am accelerated rate to simulate life expectancies.


Lift Rod:
Also known as connecting rod. Faucet component that opens the pop-up drain in a lavatory when the lift rod is depressed. When rod is lifted, the drain closes so the lavatory will retain water.


Lifting Flame:
See floating flame.


Light Duty:
Small commercial applications.


Lime:
See sediment.


Limit Stop:
Faucet control unit used to adjust maximum water temperature.


Lindane:
A white crystalline powder used as a pesticide. Lindane is banned in California and is listed as a cancer-causing chemical.


Lock Nut:
Nut fitted into a piece of pipe and screwed onto another pipe to join the two pieces.


Low Consumption Toilet:
A class of toilet designed to flush using 1.6 gallons of water or less. Also known as "water-saving" toilets.


LP:
Liquid Propane. A fuel for gas water heaters.


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