Hi,
I am trying to install an under the sink water filter. I understand I am supposed to unscrew the line from the shut off valve to the tap and connect a T adapter... my question is... that under the sink... I have two shut off valves for both the hot and cold water, One on the top and one on the bottom of both the hot and cold shut off valves.. So does it matter which line I connect the water filter to? And what's the purpose of two shut off valves on each line?
Thanks, I hope that makes sense.

It may make some sense.

First: Usually you'll find 3 shutoffs under the sink. 2 for hot: sink and dishwasher and 1 for cold. The water filter will be going on the cold water. Normally we don't like our dringing water hot.

Second:
Are the shut-offs in line with one another. If they are, someone may have added a second 1/4 turn shutoff because the first one doesn't work.

Does it look like: supply - shutoff 1 - shutoff 2 - sink?

Hi ConfusedIam:

If there is actually two shutoffs on each line.. one right on top of the other and the bottom ones don't supply anything but the shutoffs above them.. then what you have there is shutoffs that were deemed defective by someone (not shutting water off) so they installed new shutoffs above the old ones without removing the old ones!

It is not common practice for plumbers to do this.

KISS suggested the normal under sink piping... three shutoffs: 1 for cold faucet, 1 for hot faucet and 1 for hot to dishwasher... is that your setup?

Let us know more here... but sounds to me like you just want to connect into the top shutoff of the cold line.

Post back... MARK

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Thanks.
The best way I can describe this is and I'll just describe the cold water line... (but it's the same for hot): The pipe comes out of the wall... at the end of the pipe are the two shut off valves... that look like a dumb bell... with a shut off valve on the top.. with a screw on line out of it... and another on the bottom with another screw on line... The more I look at it... I guess the line on top may go to the fridge for the ice maker... does that make sense? And I have no idea where the second line on the hot water goes. So where would I attach the t adapter for the water filter?
I hope that makes sense. Thanks for the help.

Sounds like you can connect into the top or bottom of the cold water shutoff... ;)

Give it a shot... let us know how it goes... MARK

Quote:

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The pipe comes out of the wall... at the end of the pipe are the two shut off valves... that look like a dumb bell... with a shut off valve on the top.. with a screw on line out of it... and another on the bottom with another screw on line... The more I look at it... I guess the line on top may go to the fridge for the ice maker... does that make sense? And I have no idea where the second line on the hot water goes. So where would I attach the t adapter for the water filter?

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Cold side= One line to the sink and the other to thye ice maker.
Hot side= One line to the sink and the other to the dish washer.
That's how I see it. To hook up your filter you will disconnect the cold supply to the sink and connect the filter to the cold water angle stop and run a supply from the filter to the cold water side of the faucet. That's if you're going to pipe to the faucet. If you plan in installing a separate tap then cut into the cold water supply to the faucet with a Sharkbite tee, (see image) and pipe to the new tap from there. Good luck, Tom

Well, if you have a dishwasher, it probably goes there. The icemaker having a cold water line only makes sense. The dishwasher having a hot water line only makes sense.

Well, you could make it 3 lines on the cold or you can piggy back something. Make ice and new tap share a shut off, make sink and tap share a shut-off or add a new shutoff at the supply side.

Choices, choices.

I did it! Thanks for all the help. I just added an adapter to the line going to the ice maker... and it worked... and so far no leaks. (Although, I'm keeping a bucket under the sink for a while just to make sure).

Thanks again.

Congratulations! Ready to apply for plumbing school?

This is plumbing school 101, LOL