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Yes. It prevents sewer gases from entering by way of the water trapped at the elbow. Gases need an upflow which is eliminated by the P-Trap. It's not a pee trap, it's a p-trap. Yes you do need a p-trap. The p-trap holds some water in the trap to hold back the sewage gas from coming up through the sink. IN ADDITION: A P-trap can be used to unblock or unclog small blockages either in the drain pipe exiting the trap or the trap itself, because it holds water, by covering the plug, it works the same way as a plunger does and by squeezing it continuously it forms a suction drawing or pushing blockages, freeing them and pushing them further down the line until it is clear. It is useful to know when a plunger is not at hand.

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15y ago
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9y ago

Its good practice to fit a "U" trap under a sink unit or a "bottle trap". The latter is quick to install but can take up more room that a small "U" trap. However, a "bottle trap" is more accessible if there are clogs as the base unscrews quicky without effecting the pipe work.

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14y ago

No if it empties as an indirect waste in a properly vented and trapped fixture

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14y ago

It forms an air lock keeping out sewer gasses.

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9y ago

Yes, one trap for both sides or if on a single sink. The disposal does not seal out sewer gas which is what a trap does.

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Q: Does the kitchen sink need a P-trap with a disposal installed?
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Do you need an air vent installed for the dishwasher and garbage disposal and if so can it be installed another way if needed?

Your kitchen sink should already be vented if there is a p-trap draining to the wall. if it is an s-trap it is not vented and not to present code requirements. The dishwasher drain goes into the side of the disposal and the disposal should drain to the trap. A separate vent is not required for the disposal or dishwasher as the trap for the sink is what requires a vent.


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If there is no vent off the kitchen sink you would need to install an in-line vent.


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Yes, a true kosher kitchen does have two garbage cans. It is important that meat and dairy products do not come in contact with each other even in the disposal state.


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