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Old 03-30-2013, 09:57 AM   #1
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Plastic PEX for RO water


I just got a RO filter equipped with 1/4" tubing and need to connect it to 3/8" PEX lines. RO water should not contact metal fittings and I am having trouble finding plastic ones. Where can I get the following;

Two, 3/8" plastic PEX Ts (to connect to tank and branch off to frig)

Plastic 1" pipe thread to 3/8" PEX (to connect 20 gal tank to 3/8" PEX)

1/2" or 3/8" PEX to 1/4" pipe thread, to filter, or 1/4" tubing (for supply to RO filter so this could be brass)

Two, plastic 3/8" PEX to 1/4" pipe thread from filter or 1/4" tubing (for waste discharge and filtered water)

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Old 03-30-2013, 11:27 AM   #2
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Plastic PEX for RO water


www.pexsupply.com

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Old 03-30-2013, 11:57 AM   #3
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Plastic PEX for RO water


Where did you hear that RO water should not contact metal fittings?? I have no experience with residential units, but quite a lot with the design and operation of tactical military units. Trust me, with the system pressure required to make 1200 gallons per hour of potable water from seawater, every fitting is metal, either stainless steel or monel.
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Old 03-30-2013, 12:47 PM   #4
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Plastic PEX for RO water


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Originally Posted by md2lgyk View Post
Where did you hear that RO water should not contact metal fittings?? I have no experience with residential units, but quite a lot with the design and operation of tactical military units. Trust me, with the system pressure required to make 1200 gallons per hour of potable water from seawater, every fitting is metal, either stainless steel or monel.
Monel Huh? why not just use gold? Yup, our tax money at work!
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Old 03-30-2013, 04:38 PM   #5
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Plastic PEX for RO water


pex supply doesn't even show the 3/8 poly PEX T's which I figure should be the easy ones.

My understanding is that RO water is so pure that it trys to remove elements from metals. I googled it too just before posting.
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Old 03-30-2013, 05:26 PM   #6
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Plastic PEX for RO water


Quote:
Originally Posted by bkvanbek View Post
pex supply doesn't even show the 3/8 poly PEX T's which I figure should be the easy ones.

My understanding is that RO water is so pure that it trys to remove elements from metals. I googled it too just before posting.
I just had an image of little element miners with miners hats with little lights picking away at your brass fittings. They even had a canary in a cage.

I think you may be a little too worried, but you may want to Google Aquapure or one of those water treatment sites.

Edit: I just went to the pex supply site and they have all kinds of fittings under polyalloy fittings. The site is a bit confusing, but they have a lot of stuff. You can look under the individual manufacturers too.
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Last edited by jagans; 03-30-2013 at 05:34 PM.
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Old 03-30-2013, 06:47 PM   #7
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Plastic PEX for RO water


Quote:
Originally Posted by jagans View Post
Monel Huh? why not just use gold? Yup, our tax money at work!
So, what's your point? Did you ever serve in the military? I'm guessing not. I am retired from the nuclear submarine service, and much of my ship's piping was monel. In those days (and I hope also now) you used what would do the job, regardless of the cost. We won the Cold War, so I guess it wasn't such a bad deal.

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Old 03-30-2013, 07:24 PM   #8
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Plastic PEX for RO water


Quote:
Originally Posted by md2lgyk View Post
So, what's your point? Did you ever serve in the military? I'm guessing not. I am retired from the nuclear submarine service, and much of my ship's piping was monel. In those days (and I hope also now) you used what would do the job, regardless of the cost. We won the Cold War, so I guess it wasn't such a bad deal.
1964 through 1968, USAF 66-67 with the 355 Tactical fighter Wing. Rolling Thunder? That was a Hot war, as I recall, but they called it a police action, like Korea, which was also pretty hot.

When I got back to the world, and spent my last year in aircraft maintenence, I remember seeing price tags on a number 14 x 1.5 inch stainless steel screw of $65.00 Thats what I mean. I remember the supply depot burning a mountain of brand new Navy Issue Rain Gear because they could not find a lot number on it.

You are absolutely correct. If you need Monel, you Need it, especially in a Nuclear Boat, which, by the way I think is the greatest deterrent we ever put to sea. Thanks for your service, by the way.

If you try to tell me that the military doesn't waste money, I really don't know what to say.
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Old 04-02-2013, 06:19 PM   #9
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Plastic PEX for RO water


Please focus on the topic. Still can't find these parts in plastic and I did more research and I should not use metal fittings in contact with RO water.
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Old 04-02-2013, 08:46 PM   #10
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Plastic PEX for RO water


Why cant you just use 3/8 to 1/4 inch shark-bite couplings? These are available at Lowes where I live.
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Old 04-02-2013, 10:54 PM   #11
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Plastic PEX for RO water


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Why cant you just use 3/8 to 1/4 inch shark-bite couplings? These are available at Lowes where I live.
It looks like the RO water would contact the metal of this fitting.
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Old 04-02-2013, 11:05 PM   #12
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Plastic PEX for RO water


Check into John Quest fittings
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Old 04-02-2013, 11:16 PM   #13
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Plastic PEX for RO water


The water does not come into contact with metal in a watts shark bite fitting. The seal is made by an O-ring which is inside the shark teeth.
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Old 04-03-2013, 11:17 AM   #14
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Plastic PEX for RO water


I contacted SharkBite, they said
The SharkBite fittings are not plastic lined and we only have a limited amount of the barbed fittings that are plastic. and are the only sizes we offer. We only have straight couplings , elbows and Tees.
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Old 04-03-2013, 02:30 PM   #15
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Plastic PEX for RO water


I guess I was using the term "SharkBite" Like Band Aid. Watts has fittings that will do what you are trying to do, as does John Quest. I have a 1/4 to 1/4 coupling on my 1/4 inch water line to my fridge, and I know they have 1/4 to 3/8 couplings in our Lowes.

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