Check to make sure that the hoses under it are not sagging allowing water to lay in it. The noises you are hearing is usually the air being sucked through the standing water.

Also, check to make sure the noise isnÂt really coming from the drain/disposer.

FYI: The air gaps are code but after install/closing, many homeowners remove the gap, pipe the dishwasher directly into the drain and install a soap/lotion dispenser in the existing hole.

Also, besides removing mine, I took my discharge out of the disposer, capped that connection and repiped my dishwasher discharge downstream and past my p-trap for virtually no drain noises.

zl700 - Thanks for your response. The noise was coming from the air gap which goes directly into the upper left side of the T connector between my two sinks, and not the garbage disposal.

It ended up that there was a problem with my new dishwasher and I had to have it swapped out. The repair person who swapped it out said I could conform to code in my locale by having an air gap installed below the counter so I had him do that. It's much quieter and if I simply plug the left sink it's very quiet.

I'm happy with the noise now, but I have a wood floor in my kitchen and it just occurred to me to wonder if I do have water pressure problem and/or overflow, will I now have a flood under my cabinet and onto my wood floor and would I therefore be better off with a high loop and no air gap at all? Again, I appreciate the help!

"Also, besides removing mine, I took my discharge out of the disposer, capped that connection and repiped my dishwasher discharge downstream and past my p-trap for virtually no drain noises."

Is that banjo music I hear?

I've been wondering if I need an air gap with my DW here in British Columbia, I suppose you do hear the dw drain a bit, but I just love automated things so, it just reminds me it's working whilst I'm oblivious.....A raised loop would make sense, we're basically preventing backflow first and foremost, right?

zl700, you may have no drain noises but your dishwasher must smell lovely when those sewer gases come right up into your dishwasher....yuk. Not recommended, probably disgusting and also illegal.

"Also, besides removing mine, I took my discharge out of the disposer, capped that connection and repiped my dishwasher discharge downstream and past my p-trap for virtually no drain noises."

This results in NO trap for the DW and allows sewer gases to enter the DW and the house.

Traps are there to separate you from the sewer and prevent the explosive and smelly gases present in the sewer system from entering the house.

You guys are incredible.

I donÂt think the sewer gases will make through the dedicated dishwasher p-trap, raised discharge hose and the wet sump dishwasher pump included.

Shared p-traps tend to be noisy

FYI Banjo man: For most of you, IÂm sure I could fit three or more of your homes into mine.

"...dedicated dishwasher p-trap..."

Most DWs do not have an actual trap in them.
They keep enough water in the sump to cover the impeller blades, but there is not actually a trap present.

zl700l, I don't believe there would be anything in a dishwasher that would be sufficient to act as an effective p-trap and I do believe you are basically bathing the dishes in your dishwasher in sewer gas, not to mention airbourne bacteria.

The explosion risk of the methane entering the dishwasher is not to be ignored either, I am sure there is plenty of potential ignition sources in there to be of concern, moreover, people die in homes infiltrated by sewer gas. The risk is not to be scoffed at.

Moreover, it's just common sense- the practice is dangerous and illegal, makes your house unmarketable and subject to being condemned or remediation orders, and just a bad idea.

We're talking about a little gurgling water, not freeway noises. I like hearing the dishwasher when it drains because a) I know it's working and how far along it is, and b) having it drain into the p-trap means that it's charging it (keeping it full, avoiding gas infiltrations) and the dishwasher detergent going through the trap keeps it clean and smelling decent.

As the the 'banjo' vs 'my house is bigger than yours' contest, I don't believe in being rude as it were but I believe it's not a question of how much money someone has, but how much common sense /stubbornness they have.

Larger open floor plan homes tend to have kitchens and especially the kitchen sink adjacent to the family room so, I can understand the noise as I agree it was annoying.

Note: she paid for a quiet unit but still ended up with the excessive noise.

I guess some of you misunderstood me and believe I suggested bypassing the trap when I merely meant to install its own trap rather than take the easy/lazy/noisy/messy way of tapping into the disposer connection as most new home plumbers do. No different than installing separate traps for the sink(s) and disposer versus using a disposer drain kit.

Besides the wet sump trap created at the bottom of the dishwasher, and the siphon loop created with the hose, I doubt as it had been done for years that I should have any worries.

And I don't agree with you as I am sure most, banjos would bring to mind backwoods living, trailers and using duct tape for repairs. That connotation would be a tough one for you to argue. That sort of comment from the previous poster is uncalled for and unproductive.

As is bragging about how big your house is and how much you're worth (in terms of unproductiveness)

If you violate a basic, basic building code and then recommend it and attempt to justify it, you will get responses like that, sorry.

Unless you want to go out and change the building code I don't think there's much point in canvassing something so obviously illegal and unwise. Here's an angle you may relate to better - what do you think an insurance company is going to say when there's any sort of a claim and they discover your illegal plumbing? They will do their utmost to blame it for whatever happens - floods, fire (due to methane gas explosion) or what have you, or they will just use the fine print to declare your insurance null and void.

Banks base their mortgages on properties being insured, and insurable. Think they wouldn't call in a loan in this day and age based on something like that?

PB&J,

Can't read comnprehend or follow along can you?

The dishwasher has a trap, follow now?

Ay?

Hmm yes I can read and "comnprehend" (sic) just fine, your story seems to have changed somewhat. You said you "repiped my dishwasher discharge downstream and past my p-trap for virtually no drain noises" which is a lot different from "the dishwasher has its own, separate p-trap" which would have cause a lot less confusion in the first place.

As for 'reading' I done read good, I didn't see your final clarification when I posted mine, I hadn't updated the page. Considering how the misunderstanding started in the first place.....

I fully understand how my quick brief answer and short typing could be misunderstood and misintrepreted, sorry

No problem :) - Now I understand how you set it up, how did you affix the dishwasher drain hose to its own p-trap? To take full advantage of it/to make it quieter, I'm assuming it's closed/sealed so the dw drain doesn't draw air around it where it enters (as opposed to a washing machine drain that's just stuck into the standpipe) and if so, is there an issue with adding air, or does the standard vent do the job?

Just checked in and saw all the interesting responses. The under the counter air gap I now have is not a johnson tee and does not go to the outside; it is connected to the left side drain, not the disposal which is on the right. It sounds like I should switch it to a high loop. Is this something I can afford to take my time on or am I in imminent danger from a backup and ensuing flood on my beautiful new hardwood floor?

Those dishwasher air gaps tend to clog. It's a matter of when, not if. I'd go ahead and swap it out for a high loop. Only takes a few minutes to do.