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Old 12-31-2011, 10:57 PM   #1
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Shut off valve installation - different fittings issue


I went to install a new faucet just to discover that the builder did not put in any shutoff valves! The faucet has 3/8" end and the PEX pipe coming up is labeled 1/2" and the fitting appears to be a 1/2" fitting as well so I went out and bought a 3/8" to 1/2" shut off valve and attempted to install it. The 3/8" end went on fine and has finer threads but I could not get the 1/2" end to go on as the threads are completely different(fitting crimped on the PEX has very few larger threads) and it started to cross thread.

I don't know my plumbing terms and fittings but I know I have two different types of fittings of the same diameter. Is there a shutoff valve that will have the right ends on both or should I change the fittings currently installed in the PEX?


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Old 12-31-2011, 11:00 PM   #2
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Shut off valve installation - different fittings issue


A picture of what you took out of the brass/pex would be helpful to me

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Old 12-31-2011, 11:03 PM   #3
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Shut off valve installation - different fittings issue


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A picture of what you took out of the brass/pex would be helpful to me
Here's a pic of the old faucet which is what used to be connected to the fittings inside the PEX.

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Old 12-31-2011, 11:06 PM   #4
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Shut off valve installation - different fittings issue


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Originally Posted by n0c7 View Post
...to discover that the builder did not put in any shutoff valves!
The faucet has 3/8" end and the PEX pipe coming up...
What is at the OTHER end of that PEX line?
(point is that no valves is VERY unusual)

Quote:
I don't know my plumbing terms and fittings...
but I know I have two different types of fittings of the same diameter.
The basics: IPS / Copper / Compression / FLARE
In your picture I believe I see three of these four options.

Some more reading
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Old 12-31-2011, 11:07 PM   #5
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Shut off valve installation - different fittings issue


That looks like half inch male iron pipe threads. You will probably have to get short half inch nipples(threaded pieces of pipe) and half inch female thread by 3/8 compression thread valves.
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Old 12-31-2011, 11:10 PM   #6
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Shut off valve installation - different fittings issue


Quote:
Originally Posted by TarheelTerp View Post
What is at the OTHER end of that PEX line?
(point is that no valves is VERY unusual)

The basics: IPS / Copper / Compression / FLARE
In your picture I believe I see three of these four options.

Some more reading
Just posted a pic of what was at the other end.
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Old 12-31-2011, 11:11 PM   #7
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Shut off valve installation - different fittings issue


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Originally Posted by broox View Post
That looks like half inch male iron pipe threads. You will probably have to get short half inch nipples(threaded pieces of pipe) and half inch female thread by 3/8 compression thread valves.
Ok so what actually converts the iron pipe threads to compression?
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Old 12-31-2011, 11:30 PM   #8
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Shut off valve installation - different fittings issue


So I just re read your answer and I guessing you mean I need to find a 1/2" NPT to 3/8" compression(not sure of acronym)?
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Old 01-01-2012, 07:02 AM   #9
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Shut off valve installation - different fittings issue


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So I just re read your answer and I guessing you mean I need to find a 1/2" NPT to 3/8" compression(not sure of acronym)?
Yes.......
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Old 01-01-2012, 07:45 AM   #10
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Shut off valve installation - different fittings issue


Alternatively you can purchase a PEX shut off valve that has compression on one end, and half inch PEX connection on the other. I have three or four of them in my house. By the way, that looks like Wirsbo expansion couplings on your PEX, you need a special tool to install that kind of fitting, but if you cut off the pipe below the ring you can use alternative types of connections.
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Old 01-01-2012, 05:16 PM   #11
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Shut off valve installation - different fittings issue


Thanks for all the info. I've successfully installed the new faucet using a short extension with the proper valve as mentioned above. Also spent time reading about the types of threads out there to familiarize myself since I wasn't aware there was so many types! Guess I was just lucky in my past small jobs that I had the right fittings.
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Old 01-01-2012, 05:17 PM   #12
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Shut off valve installation - different fittings issue


Quote:
Originally Posted by Daniel Holzman
Alternatively you can purchase a PEX shut off valve that has compression on one end, and half inch PEX connection on the other. I have three or four of them in my house. By the way, that looks like Wirsbo expansion couplings on your PEX, you need a special tool to install that kind of fitting, but if you cut off the pipe below the ring you can use alternative types of connections.
Yup wirsbo. Thanks for the alternative options.
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Old 01-01-2012, 10:36 PM   #13
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Shut off valve installation - different fittings issue


Forgot to ask another amateur question - inside the fittings crimped onto the pex were black rubber washers probably left over from the old faucet. They were corroding and did not fit well with the new nipples. I removed the washers and used Teflon tape. Is this ok long term?
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Old 01-02-2012, 12:51 AM   #14
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Shut off valve installation - different fittings issue


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Originally Posted by n0c7 View Post
Forgot to ask another amateur question - inside the fittings crimped onto the pex were black rubber washers probably left over from the old faucet. They were corroding and did not fit well with the new nipples. I removed the washers and used Teflon tape. Is this ok long term?
The black washers worked like the washers in a garden hose. They are part of the pex x fip fittings. If they are not leaking now then i wouldn't worry
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Old 01-02-2012, 01:09 AM   #15
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Shut off valve installation - different fittings issue


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Originally Posted by TheEplumber

The black washers worked like the washers in a garden hose. They are part of the pex x fip fittings. If they are not leaking now then i wouldn't worry
Ok. The HD helper told me that if they were corroded that I could remove them and use Teflon or pipe dope as I would have to buy a new fitting just for the washers. Just want to make sure this will last over the years. No signs of leaks yet.

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