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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?

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 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.


Can acetone be use as substitute for PVC primer?

No, it will not work for that.


Does adding water to primer help it work better on dry wall?

No, not a good idea . If that was the case the people who made primer would do it.


I used primer meant for drywall on an iron bed will it work or what should I do. I have already put gloss on it. It looks okay will it hold up?

If the primer was a water based primer, then you are in trouble. If it was, then you need to strip it down to the metal and use either an oil based primer or I would use a primer made by Rustoleum.


Can you use liver to trap hornetsor Will sugar work?

I am looking for an ingredient to trap yellow jackets? I have a trap but do not know what to put in to the trap so they will go into it?


Why won't fuel primer work on briggs and stratton lawn mower engine?

Check the gasket between the air filter backing plate and the carburetor. Usually if that is sucking air then the primer won't work. Your best bet would be to just replace the gasket and possibly the primer bulb as well


What to use over oil paint when using latex?

Preferably an oil-based primer. If oils are not available in your area, then a 100% acrylic primer will also work.


Will the PVC pipe primer used in plumbing work as a primer for painting vinyl window frames?

Sounds like it's worth trying, -good idea .


Does two in one paint and primer actually work?

Yes, from personal experience two in one paint and primer does work. If you are not sure you can always go to a place like Lowes or Home Depot to get some more answers.