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How do you install a trap primer?

Updated: 10/25/2022
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14y ago

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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.

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Q: How do you install a trap primer?
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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.


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?

A trap primer line is typically connected to the domestic cold water line, not the DWV system. Its purpose is to prevent evaporation of water in floor drains or traps by periodically supplying small amounts of water. In some cases, local plumbing codes may dictate specific requirements for trap primers.


How does a trap primer work?

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.


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.


How do you un clog a p trap?

Disconnect and remove p-trap from under fixture. Clean out clog in p-trap and re-install.


How do you install pipe without p-trap?

You need aP-trap under every sink. Get a plumber if you don't know what you are doing.


How do you install condensate p-trap?

The same as any other P trap except it should empty into a properly trapped and vented fixture


Where do you install kitchen p trap?

under the sink waste plug hole


Is it satisfactory to install a bathtub vent 5 feet down stream to a direct vent strictly for the tub?

Absolutely NOT What is possible (Check local codes) is to install the trap 2 ft from the fixture and the vent 2 ft from the trap BUT if the trap is not easily accessible then your going to have major problems snaking the line


What can you do to stop the sewer smell coming from your septic tank?

Check the venting and possibly install a trap


Can a registered plumber install a new gully trap on an exising drain?

Yes, most certainly.


Can you put a shower on an existing toilet drain?

If you reduce the soil connection to 2" and install a trap