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Old 11-13-2010, 02:12 PM   #29
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I will also embark on the plumbing journey this weekend. I have 1/2" PEX, Sharkbite fittings, and a polyethylene fresh water tank.

Do I need to use plumbing tape (pipe tape) on the male Sharkbite fitting that will go into the threaded female tank outlet?

Thanks.
Okay I realize this question might have an obvious answer, but when I was equipping the ABS pipes/connectors on my black water tank, the technicians specifically said NOT to use pipe tape. I used a plumbers non-stick putty instead, but wondering what to do with copper to polyethylene.
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Old 11-13-2010, 03:46 PM   #30
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Just a couple of comments on PEX installation. I have used it is several houses and in my 87 AS. I have used only the copper crimp fittings with the large crimping tools and the recently developed crimp tool for use in tight places using a pair of vice grips for the crimping pressure. Both work great. With the crimp fittings you can rotate the elbows, valves, and other fittings for proper orientaion without any problems. This assumes you use the GO-NO GO gauge supplied with your crimp tool on each fitting. The use of the guage is critical for no leaks.
The PO of my AS used PEX with shark bite fittings on a minor repair. He did not seat the PEX tubing properly at one spot due to the tight situation of the repair. A "blow-out" occured on my first trip. Mark your PEX about 1/2" back from the end before you insert into the shark bite fitting. This mark is a good reference to insure your tubing is properly seated in the fitting.
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Old 11-13-2010, 06:14 PM   #31
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Pex won't bend that sharply. For a pex bend that tight I think you would have to use 2-L's.

If you are using crimp connectors ( I did ), make up your joints as a dry fit and mark the orientation of the fitting and the tube with a sharpie. The fittings tend to turn a little when you are getting the rings in the crimper and that will cause problems with alignment. In fact, I found that if you mark the fittings, put a copper ring on and just lightly crimp it with a pair of pliers, it will stay where you want it as you put the big crimp tool over the rings.
I beg to differ!

There are 45* and 90* plastic or aluminum braces available that WILL allow you to put 45* or 90* bends in PEX that are just that tight with no problems.

I use them on a regular basis on the large motor homes that I work on, as do the OEMs on initial installation. Why add fittings (and extra leak potential) when you can have a one-piece 'home run' from a distribution manifold right into the outlet?
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Old 11-13-2010, 08:50 PM   #32
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Is that 1/2" from the end or 1"? I have heard 1" was the right insertion for sharkbite.
Lewster--where do you find those braces?
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Old 11-13-2010, 11:29 PM   #33
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Alan:

I would like to look at a picture of the marine hose outlet. I need to order one also. It looks like I have the same layout for the plumbing. I just got my furance and hotwater heater. I know what you mean about the heat coming out of the furnace. I never gave much thought about the heat on pex. I was wondering if I can go put the pex pipe up against the inner wall between the wall and furnace. I think I might have enough play to get the heat vent on the furnace if I move the furance back 1/2 inch for the pex.

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Old 11-14-2010, 06:58 AM   #34
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Seems like that's where the copper in mine was. Nearest to the wall gehind the furnace. The marine water inlet is a chrome and brass piece, looks pretty sturdy.
I did not see any cruved braces on line yet, still looking.
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Old 11-14-2010, 09:03 AM   #35
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Is that 1/2" from the end or 1"? I have heard 1" was the right insertion for sharkbite.
Lewster--where do you find those braces?
The little 'gizmos' are called 'elbow clips' and IIRC, they are sold by Sea-Tech... the company that makes the plastic PEX quick connects. They come in sizes for both 1/2", 3/4" or 1" PEX for tight 45* and 90* bends without kinking the tubing.

My wholesale plumbing supplier carries them, but I don't know if they are available at retail. Let me know if you can't find them and how many you need.
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Old 11-14-2010, 09:07 AM   #36
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Seems like that's where the copper in mine was. Nearest to the wall gehind the furnace. The marine water inlet is a chrome and brass piece, looks pretty sturdy.
I did not see any cruved braces on line yet, still looking.
Look here: Sea Tech Elbow Clips
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Old 11-14-2010, 10:02 AM   #37
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Tape ? Pipe dope?

Quote:
Originally Posted by SpaceEgg View Post
Okay I realize this question might have an obvious answer, but when I was equipping the ABS pipes/connectors on my black water tank, the technicians specifically said NOT to use pipe tape. I used a plumbers non-stick putty instead, but wondering what to do with copper to polyethylene.
I would use pipe dope,if you put on too much tape and over tighten just a bit too much you can crack the plastic. Dave
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Old 11-14-2010, 11:07 AM   #38
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The little 'gizmos' are called 'elbow clips' and IIRC, they are sold by Sea-Tech... the company that makes the plastic PEX quick connects. They come in sizes for both 1/2", 3/4" or 1" PEX for tight 45* and 90* bends without kinking the tubing.

My wholesale plumbing supplier carries them, but I don't know if they are available at retail. Let me know if you can't find them and how many you need.
thanks a lot..not quite ready for the pex yet...soon I hope.
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Old 11-15-2010, 04:55 AM   #39
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Alan:

I will be curious to know how you plumb your trailer. I am going to put two water tanks in mine. One under the twin buy the water heater and the other will be under the front window. I am trying to map it out in my head.

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Old 11-15-2010, 10:38 AM   #40
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I am eliminating the tank. With all 4 Airstreams we almost never used the tank and pump at all. I expect to keep this trailer a long time, and one could be added down the road if needed. I hate the water line running thru the living room across the floor.
I am going with a tankless heater most likely as well. Really like the Marey unit I have seen in a few trailers now.
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Old 11-15-2010, 03:28 PM   #41
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Pex manifold?

Anyone use a manifold for the pex? I was think a manifold would make a very clean install. I see a lot that are 1" center with 1/2" branches...would that work or do you have to get a 1/2" in ...(I am a total newbie to this stuff)
The one in the photo is 1/2" all over with a 3/4/ pipe center.
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Old 11-16-2010, 05:59 AM   #42
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The mainfold fitting in your photo works great but are used most of the time on more complicated plumbing jobs. For most AS requirements the simple "Tee" fitting will be adequate unless your are making multiple pipe runs from a single point to each faucet. Try to keep your tubing sizes to a minimum (like all 1/2" or 1/2" with 1/4") - keep your plumbing layout simple. When camping you are only using one faucet at a time most of the time.
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