I am trying to install my double sink. I had a sink sink before. I was told I need a T to go on the main pipe where the garbage disposal is. RIght? Would you please give me steps on how to install my double sink. I just did my countertops in marble and finally am ready for the sink. I am scared of plumbing stuff, only because of water leaks.
Help??

Paws,
You piggybacked on a two year old thread so I gave you one of you own.
There are several ways to hook up your sinks. You may use one trap and a continuous waste to run the drainage, **OR**
You can come out of the wall with a wye and pick up each tub with its own trap.
What's your pleasure? Tom

Hi Gp...

What kind sink? Is it undermount,drop in type, etc.

Is there a disposal? How about a dishwasher?

Finally what are your pipes made of? Copper or PVC?

Back to you...

MARK

Hello Groomedpow,

Respond to Tom and Mark for more directions, I have also attached some images that will may help you, Thanks.

John

Groomed paws...

No need to respond to my questions... :) John (afaroo) showed you everything you need!

Great job, John! NICE!

MARK

THnak you so much, the diagram is WOW! MY sink is cast iron and the garbage disposal was on the left on the old single sink. I also have a dishwasher. Do I use the first diagram or the second one for mine? Fantastic response

You can use either one it depends where you install your G/D and where is your D/W located it is up to you the lay out will be the same and which one works for you, Thanks.

John

I just have one last question? Lol
You can laugh if you want, however, this is the first time I installing a double sink. I did do my marble counters very well and backsplash though. Anway, at which points do you use puddy and or plumbers tape?
I really appreciate all the help!!

Plumbers tape (typically white), us used on tapered threads an you may not have any, There is yellow and pink. Yellow is used for gas, although most prefer pipe dope.

Don't use it on the straight threads or any compression fittings.

I like to use a little bit of silicone grease (plumber's asile) on the threads, so they will come apart easier in the future. It basically acts as an Anti-Seize compound in this application.

Plumber's putty will be used for the ring on top of a sink if you have a ring and will be used to seat the drains.

Be generous and remove the excess and reuse. Roll to about 1/2" diameter and place on the ring of the drain and compress with the nut on the bottom of the sink. Any excess will flow out.

The drain could use a gasket at the top without putty.

DO NOT use plumber's putty under the faucet or the spray... putty will damage marble quite quickly. Here, use the gaskets provided with the faucet OR use silicone caulking... ;)

MARK

John or Mark,
Is there a way to show me a diagram (like the one you provided) WOW!
With area where the puddy or tape goes? I know that is asking a great deal but I am so afraid of water leaks. I guess by now you must figure I am a girl... but I can dyi jobs!
Plumbing has always scared me. I get where everything kind of goes and have it all, but it's the leaks??
Thanks guys!

Install the sink mounting flanges assembly. With your hands, roll a generous amount of plumber's putty into a snake and apply it around the rim of the sink flange where the rim meets the sink drain hole. From above the sink, press the flange into the drain hole. From underneath the sink, install the gasket, the backup ring if one comes with your model, the mounting ring and the snap ring over the neck of the sink flange. Tighten the screws on the mounting assembly, alternating screws as you tighten, until the ring is uniformly secure. Then, from above, remove any excess putty from around the flange seal.

The above instruction is for the G/D and the same applies to the other side.

The tape applies on the threaded fittings,

Good Luck.

John

The tape applies on the TAPERED threaded fittings.

If you need help with how to install the G/D please ask one of us will tell you how to install it, Thanks.

John

I am very very great full that I am getting a good rating from the masters like Tom and Milo Thanks a lot.

Best regards,
John

There is another way that my company used on new installations and that 's coming out of the wall with a wye, (see image) and picking up the tub and disposal with a separate trap. Just giving you all the options. Good luck, tom

Super Tom thanks
ELYSE
How do I rate answers ? Everyone has been so helpful


Iwas just told to use cement for the pipes that do not have thread. Is this true? I know that you guys told me to use Plumbers Dope for threaded.
Thanks

Most of the pipes that you will be using are called slip joints. They have a connical washer that makes the seal. A little bit of plumber's grease may help here, same for rubber gaskets.

No, Pipe thread tape for TAPERED threads like these: National pipe thread - Wikipedia, the free encyclopedia

None of these types of fittings use dope or tape: Tubular bathroom drain products and p-traps and sink drains from FAMOUS PLUMBING SUPPLY

Recommend silicone plumbing GREASE.

Compression doesn't use tape either. Brass compression fittings - PlumbingSupply.com

The MIPS is Male Inch Pipe Standard, i.e. NPT and it needs tape.

You should not need pipe dope. It's a liquid and it's messy.

Now when it comes to PVC fittings, again not the threaded stuff these are solvent welded. It done the following way:

1. Cut, debur and dry fit everything.
2. Then you take the PVC primer and swab both pieces.
3. Then you take the solvent cemant a swab both pieces. You only have a short amount of time to put them together.
They don't come apart after that ever.

Watch, because there is PVC, CPVC, ABS, transition and universal systems.

You want the PVC system for PVC drains and both parts can come in the same system.

Some systems require the use of a cleaner solvent too.

I don't think the following was addressed:

What do you have coming out of the wall that you have to mate to?

Are you comfortable doing that?

Can you take a picture of the area and post using Go advanced / manage attachments?

BTW: 22 1/2 degree elbow fittings help to get things to line up.

PPS: The wall can be any number of things like galvanized or PVC. Threaded or slip joint. Rubber Ferno couplings are also possible. They can connect new PVC to a CUT galvanized pipe.

PPPS: NPT fittings basically can only be tighened so much and they have to be tight. This is usually 2-3 turns past finger tight.

PPPPS: Compression fittings like used for the water supply lines. Inspect to make sure they aren't cracked. Don't use teflon tape, pipe dope etc. You MAY use silicone grease. It's not required. Tighten finger tight and tighten about 1.5 turns. Make sure tube has bottomed into the fitting before tightening. For plastic tubes use a nylon ferrule. For brass tubes use a brass ferrule.