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| General Terms |
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| Abrasion Resistance |
| the ability to withstand the effects of repeated wearing, rubbing, scrapping, etc. |
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| ABS |
| Acrylonitrile-butadiene-styrene. Rigid black plastic pipe used for Drain, waste, and vent lines |
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| Absolute Filter Rating |
| Filter rating meaning that 99.9 % (or essentially all) of the particles larger than a specified micron rating will be trapped on or within the filter. |
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| Absolute pressure |
| Atmospheric pressure added to gauge pressure. |
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| Absorption |
| The process in which one substance penetrates into the body of another substance, termed the absorbent. An example is the absorption of water into soil. |
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| Absorption Field |
| A leeching or seeping field engineered to receive septic tank effluent. |
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| AC |
| Alternating current. Electrical supply in which polarity of wire. Reverses rapidly (e.g. 60 cps) |
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| Acceptance Factor |
| Bladder tank drawdown expressed in percentage. |
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| Access Panel |
| Covered opening in a wall or ceiling near a fixture that allows access for servicing a plumbing or electric system. |
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| Acid |
| A substance which releases hydrogen ions when dissolved in water. Most acids will dissolve the common metals and will react with a base to form a neutral salt and water. An acid is the opposite of an alkali, has a pH rating lower than 7.0, will turn litmu |
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