I just bought a home that has a single sink in the kitchen. I replaced the existing faucet with an new one. The old setup had the sprayer all together with the faucet and the hole where the new sprayer needs to go has some rounded cap that is connected to the side of the garbage disposal under the sink. The new faucet's sprayer needs to mount where the rounded part is. What is the rounded part that hooks to the disposal? And how can I remove it? The back of the sink has 4 holes, the new faucet uses 3 and the sprayer needs to use the 4th.

That round thing is an air gap for the dishwasher. It prevents water from the sink drain from going into the dish washer.

Some local plumbing codes require an air gap, some permit a "high loop" in the dishwasher drain hose. Some plumbers prefer the "high loop" over the air gap.

It can be removed if you do the "high loop", that is attach the dishwasher hose to the underside of the countertop, and then back down to the disposal.

Ok, I was confused because it hooks into the side of the disposal. I also am having a hard time removing it from the sink. It looks like there is a plastic nut but at the bottom it flares out into two pipes so I am not sure how the nut comes off. Thank you very much

Here is a fast drawing

Pull the chrome cap off, remove the nut and take air gap out from bottom. Remove air gap and hose to disposal. Connect hose from dish washer to disposal, attaching up to underside of sink as shown. May have to get longer hose. May have to get adapter to make hose fit disposal.

Thanks Harold! I see you are not to far away

If it permissible in your area to remove the Air Gap and use the high loop in your area then do it as Harlod says, good luck.

John

Yes, in fact I have lived in Woodbridge and still own home there. Wouldn't worry about PW code.

To add a bit to all this. If your concerned about installing a high loop, (you may have to purchase a new hose to do this,) let me put your fears to rest.
In the 5 years the Plumbing Page has been on the net we haven't got even one complaint about a high loop failing to do its job. However, Counter Top Air Gaps are arother story. Plenty of problems with them. Remove the Air Gap and Install your new faucet with the sprayer. Good luck, tom

Thanks guys for the help. I am in the middle of a kitchen remodel and the new dishwasher is sitting in the garage so at the moment I don't have a dw hooked up. One thing I just thought of, where does the hose the high loop hose hook to the dw?

One thing I just thought of, where does the hose the high loop hose hook to the dw?
The hose should already be connected in the rear of the dishwasher. If you're asking where to connect to a disposal unit it has a port on the side the hose connects to with a hose clamp.(see image) Note: This port has a knockout plug that must be removed before the hose can be connected
Good luck, Tom

Awesome, you guys are great!

See The image below it may help you, good luck.

John

You hook it up the same way but with out the Air gap Tom has posted the Images with out the Air Gap I just posted mine to show it is almost the same hook up, Thanks.

John

afaroo, that picture made everything clear. I didn't have my dishwasher installed so I the air gap only had the hose going to the disposal. Now I see the whole picture. Thanks!

Wait a minute we all were asuming that you have a DW, but say no DW it is very simple you don't need aa Air gap or istall high loop, if the small rubber hose is connect to Garbage disposal and the plug in GD is removed you need to plug the end of the hose some other wise there will be a miss inside cabnet, Good Luck.

John

I do have a dishwasher, its just not in the house at the moment due to a kitchen remodel

i do have a dishwasher, its just not in the house at the moment due to a kitchen remodel
Install a high loop on the DW and a sprayer in the old air gap opening. Good luck, Tom

I believe now you got the idea do it as Tom says and you will be OK, Good Luck.

John

Ok, small problem. How in the world do you get the air gap out? I loosened the plastic nut from under the sink but it only unscrews so far due to the bottom of the pipe y'ing out. It won't pull out from the top or bottom? Do I have to cut it in half or something?

You remove the cup from above. There is a plastic nut on the base of the stub out. Unscrew that nut. The air-gap will fall down through the hole.

Hmm, I can't get it to fall down. Maybe its stuck after being there for several years. Hafta bust out a hammer maybe.

Yes, it may be stuck. Some HomeOwners caulk it down to the sink. Additionally, there are 2 hoses that keep it in upward position. Push on it hard or easily tap it with hammer.

OK, I'll try that when I get home. The whole assembley is loose and the plastic nut is unscrewed as far as it will go. I can move it up and down about 3 inches but each end is too big for it to just slide out.

Yes, it is hanging on the 7/8" and 5/8" hoses. They are kind of stiff. You will have to either cut them or undo the clamps that hold the hoses on air gap.

Metal blade on my jigsaw did the trick. Mission accomplished. Thanks guys

Bingo ! Another Air-Gap sent to Air-Gap Heaven ! Tom would love it ! :D

Glad to be able to help you !

Hi Milo,

You Did it again and handled this one very good and like you said Tom would love this he really loves the hi loop, Thanks.

John

It's not as much as loving a high loop, that works all the time, as disliking a counter top air gap that Can clog up and flood. High loops rule!!
Tom