| "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% greater thickness than Type "M". |
| LDO |
|
Lint, Dust, and Oil |
| LH |
|
Left Hand |
| LP |
|
Liquid Propane. A fuel for gas water heaters. |
| 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 a 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 Tray / Tub |
|
Very deep sink used in a laundry room for soaking or washing clothing. |
| Lav |
|
Lavatory |
| Lavatory Tube |
|
Water supply tube for lavatory |
| Leach Field |
|
Porous soil area, through which septic tank leach lines run, emptying the treated waste. |
| Leach Lines |
|
Pipes that carry effluent from the septic system out to the leach field. |
| Lean Mixture |
|
An air-gas mixture that contains more air than needed for complete combustion of the gas. |
| Leader Pipe |
|
Pipe carrying rainwater to the ground or sewer. |
| Linen |
|
A legal right to hold another's property, or to have it sold, or applied for payment of a claim, especially to satisfy a debt. |
| Liner Release |
|
A written document from the contractor to the owner that releases the Lien, Mechanic's or Material following its satisfaction. (see Mechanic's lien) |
| Linen Waiver |
|
A written document from a contractor or material supplier having lien rights against an owner's property that relinquishes all or part of those rights. |
| Lifting Flame |
|
See Floating Flame |
| Life Cycle Labs |
|
A place where water heaters are tested at an accelerated rate to simulate life expectancies. |
| Light Duty |
|
Small commercial applications |
| House Trap |
|
U-shaped fitting with two adjacent cleanout plugs visible at floor level if main drain runs under floor. |
| Lime |
|
See sediment |
| Limit Stop |
|
Faucet control unit used to adjust maximum water temperature. |
| 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. |
