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How does a trap primer work?

Updated: 11/4/2022
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16y ago

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An automatic trap primer works by pumping water into a drain trap. The water is sent from a cold water line in small amounts each time the line runs water. There must be an air gap between the drain water and the fresh water line. The simpler manual trap primer is provided by your usage of the drain. For a seldom used drain pour water into it every few months. A little mineral oil in the drain will slow the evaporation by sealing the water from the room air.

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Q: How does a trap primer work?
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Is a trap primer line where it is connected to the waste line part of the DWV system or could it be a by code domestic cold water line?

Trap primer is connected to domestic cold water line close to a fixture. Trap primer water line runs to a DWV trap made for trap primer usage.


How do you install trap primer?

You purchase a tap set for the laundry tub that has a built in trap priming nipple and then run 1/4" Polyethelyne tubing from that nipple to the trap in the floor drain.Floor drain collars with trap primer nipples are available.The tubing may be run under the poured concrete floor of the basement.Each time the water is used in the laundry tub, a trickle of water is also sent to the trap, preventing it from drying out.


How do you install a trap primer?

You purchase a tap set for the laundry tub that has a built in trap priming nipple and then run 1/4" Polyethelyne tubing from that nipple to the trap in the floor drain.Floor drain collars with trap primer nipples are available.The tubing may be run under the poured concrete floor of the basement.Each time the water is used in the laundry tub, a trickle of water is also sent to the trap, preventing it from drying out.


What does a trap primer do when it fails?

You know a trap primer has failed or is not working properly if the drain dries out and begins to smell like sewer gas. Sometimes the primer can be adjusted with an Allen wrench to get the water dripping again. Turn the Allen nut counterclockwise until you can see water dripping through the airgap. In my opinion as a journeyman plumber, they are notorious for failing over short periods of time.


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