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Old 07-08-2020, 06:50 PM   #1
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Waterline Diameter

As im sitting at home im thinking of the things I need to do but my camper is parked elsewhere. Its a 1988 16ft. I have a leak in the valve behind the toilet. From my scavenging online ive come to the conclusion that the toilet is a thetford aquamagic iv and i ordered the valve as such. But i would also like the install some shutoff valves so i can cut the water to certain outflows when i have leaks like that in the future.

Can anyone tell me what the size of the standard grey waterline thats used throughout? Easy enough to measure but again its parked elsewhere.
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Old 07-10-2020, 10:29 AM   #2
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Sunline used 1/2" OD pex normally. This was the older gray piping and the newer red and blue piping.

I am not 100% sure your 1988 is 1/2" but odds are high it is 1/2" OD pex.

Hope this helps

John
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Old 07-11-2020, 02:42 PM   #3
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OD or ID? I though it was 1/2" ID.
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Old 07-11-2020, 09:23 PM   #4
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The campers are setup on 1/2" "nominal" PEX. Sorry I didn't clarify. And PEX has it's own set of standards. 1/2" PEX measures 0.625" (5/8") on the OD and the ID 0.485" (~ 31/64") with a 0.070" wall thickness. It is closer to the ID but it is a nominal and not a true ID. If you ask for 1/2" PEX, you get that nominal size and all 1/2" rated pex fitting fit the tube.

The industry never really standardized on the same thing for different materials and what changes when pressure ratings change. PEX, being used a lot on water systems have a PEX standard for the fittings and the tubing.

Other tubes, pipes, hoses follow their on set of standards but this can fit many of them. The only way to know, is look up the material and the standard for that material.

"Tubing" like copper tubing, steel and stainless tubing goes by a precision OD as the fittings compress/fit on the OD. The ID can change with higher pressures and different materials. The OD is very precise. 1/2" tubing is very close to 0.500" as the fittings have to work on the OD.

"Pipe" goes by a nominal OD which many times is not even close to the real fraction number. 1/2" pipe has an OD 0.840" which is close to 27/32". The OD stays the same nominal size but wall thickness changes by schedule of the pipe and the ID gets smaller with increasing schedule.

Hose can be a free for all depending on what the hose is used for, (water, gas, oil etc.) Most times hose is by a nominal ID. The OD changes greatly by the pressure ratings. A 1/2" hose can be close to 1/2" but it changes depending the material of the hose.
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Old 07-11-2020, 10:05 PM   #5
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To maybe help, I do believe this is the trail of the older gray tubing verses the newer PEX. The sizes of the piping/tubing are very close to same, but the material they are made out of is different.

The older gray I believe is what was called Polybutylene also called PB and it was gray. From what I understand the PB would break down over time and possibly leak. It seems it was used mainly between 1978 to 1995. PEX overcame the material issues, changes colors too has since replaced PB. I think PB may have been outlawed for new use. Sunline may have changed over to PEX sooner then 1995 as I am not sure what model years they changed over.

I was never into using PB tubing so I am not totally sure on the history trail. Sharkbite makes transition fitting that go between 1/2 PB to 1/2" PEX. Not sure of the exact dimensions of the 2 materials, but if Sharkbite makes a transition fitting, something must be different. https://www.sharkbite.com/resources/...r-or-cpvc-pipe

John
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