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Old 11-12-2019, 07:07 AM   #21
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I prefer copper tubing with flair fittings .Available world wide for repair or modifications.

The problem I have with pex is houses usually use city , not well water so have chlorine in the water.
The water in most houses doesn't sit for weeks or months in a vented tank, so the chlorine stays useful.

Plain old copper does not grow green stuff on its pipes .
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Old 11-12-2019, 07:28 AM   #22
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Make sure that all PEX tubing is covered/protected from UV light since that deteriorates it quickly, and the last thing you want is a brittle pipe with water under pressure.

PEX-A can be reheated if you kink it to remove the kink, but PEX-B can't, so you have to splice the area where the kink occurred or replace the section.
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Old 11-12-2019, 07:35 AM   #23
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How about John Guest fittings?
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Old 11-12-2019, 10:44 AM   #24
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Originally Posted by FF View Post
I prefer copper tubing with flair fittings .Available world wide for repair or modifications.

The problem I have with pex is houses usually use city , not well water so have chlorine in the water.
The water in most houses doesn't sit for weeks or months in a vented tank, so the chlorine stays useful.

Plain old copper does not grow green stuff on its pipes .


I use copper where my freshwater runs along the bilge and up to the waterline. Then I chose pex up into the cabin and running to the sinks. So I get the best of both worlds.

Actually, the copper froze and expanded and burst. I just cut the copper off at the waterline where it stays warmer and connected a shark bite to the copper and replace everything above.

Now, where is that seasonal message about nothing freezing in Seattle.
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Old 11-12-2019, 11:27 AM   #25
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Has anyone here every tried installing a small air valve so you could blow out the water lines when winterizing?
Yes, like TT, I use compressed air to blow out the pipes for winter. I installed air fittings on the water lines and it's very quick and easy. I used to pump potable antifreeze through the lines but air is easier.
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Old 11-12-2019, 12:24 PM   #26
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If you are going for permanently attached fittings (as opposed to quick connect type) an advantage of the Uponor PEX A type is that it is often much easier to use the expansion tool than an external crimper in confined spaces, like you have on a boat.
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Old 11-12-2019, 12:52 PM   #27
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I clinched/pinch clamped (as suggested by Rick B.) using the following tool...


Not one leak ever on first try and this one handed tool made it easy to do fitting way back...out of reach with 2 hands.


The second link is to Aqua-pex ...I think I used it because of it's flexibility.....though I forget now.


https://www.homedepot.com/p/Apollo-3...E&gclsrc=aw.ds


https://www.supplyhouse.com/Wirsbo-U...coil-2173000-p
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Old 11-13-2019, 04:22 AM   #28
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When I installed the PEX tubing I created a manifold with an isolation shutoff valve and drain plug and also a small valve that I can use as both air valve and antifreeze from my 5 gallon bucket. It literally took me 15 minutes to connect the bucket, fill it with antifreeze, turn on the pump and walk around to all my sinks and deck wash-down, and disconnect everything. Winterizing just became a thing to do no longer a chore.
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Old 11-13-2019, 04:24 AM   #29
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If your using crimps I would also get the crimp remover tool. Makes life that much simpler if you mess up. Home depot has a few kinds.
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Old 11-13-2019, 05:40 AM   #30
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One other point not mentioned is diameter of PEX to use.
Many marine supply places carry 14mm tube & fittings where the building supply places carry 1/2 inch.
They are close but not interchangeable so you need to decide and plan accordingly.
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Old 11-13-2019, 08:24 AM   #31
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Iím a big fan of Sea Tech fittings. They are very easy to use. You just cut the tube to length and shove it into the fitting. No special tool needed and they are easy to disassemble also. The fittings are reusable if you need to make changes.
I'll second this. Had several as well as QEST, which are similar on my boat. They make it extremely easy to switch out or add equipment and fixtures. Good customer service too.
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Old 11-13-2019, 10:33 AM   #32
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When I installed the PEX tubing I created a manifold with an isolation shutoff valve and drain plug and also a small valve that I can use as both air valve and antifreeze from my 5 gallon bucket. It literally took me 15 minutes to connect the bucket, fill it with antifreeze, turn on the pump and walk around to all my sinks and deck wash-down, and disconnect everything. Winterizing just became a thing to do no longer a chore.
A picture of that would be great if you had one. Understand if it's already put away for the winter though.

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Old 11-13-2019, 01:54 PM   #33
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One other point not mentioned is diameter of PEX to use.
Many marine supply places carry 14mm tube & fittings where the building supply places carry 1/2 inch.
They are close but not interchangeable so you need to decide and plan accordingly.
That's good info. I didn't know the marine stuff was 14mm. Thanks.
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Old 11-13-2019, 05:28 PM   #34
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Quote:
Originally Posted by psneeld View Post
I clinched/pinch clamped (as suggested by Rick B.) using the following tool...


Not one leak ever on first try and this one handed tool made it easy to do fitting way back...out of reach with 2 hands.


The second link is to Aqua-pex ...I think I used it because of it's flexibility.....though I forget now.


https://www.homedepot.com/p/Apollo-3...E&gclsrc=aw.ds


https://www.supplyhouse.com/Wirsbo-U...coil-2173000-p
That way out of the way, and out of direct sight, is exactly what I am looking at. I will have video up on my YouTube channel, Buena Ventura Life, in a day or two of what the freshwater lines in the aft head look like. There is hot and cold in to a pair of T's with one line to the sink faucet and a second line to the shower faucet.


Being able to do a tight connection with one hand while watching on a cell phone is important.
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Old 11-13-2019, 09:42 PM   #35
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Whoever invent shark bite fittings is up there with the inventor of Air Conditioning IMO. Love those things.
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Old 11-14-2019, 09:17 AM   #36
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That's good info. I didn't know the marine stuff was 14mm. Thanks.

Our Navigator has 15mm primary lines around the boat and the one larger line from the tank to the pump is 22mm.
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Old 11-14-2019, 09:32 AM   #37
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14 mm = 0.551181 inch
1/2 inch pipe is 12.7 mm
I am wondering if these are reference numbers and not actual exact measurements.
would a 14mm be same as 1/2" in actual product
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Old 11-14-2019, 09:48 AM   #38
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14 mm = 0.551181 inch
1/2 inch pipe is 12.7 mm
I am wondering if these are reference numbers and not actual exact measurements.
would a 14mm be same as 1/2" in actual product


No, they are different, so you need to be sure you know which you have. And the quick connect fittings are different too. Some are metric and some are SAE. Whale, for example, are predominantly metric.
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Old 11-14-2019, 11:11 AM   #39
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If you go the SAE route for PEX, the biggest assortment of fittings and tools that I've found is at supplyhouse.com. Their tubing is PEX A, which is required for the Uponor system. They also stock many valves and specialty fittings that are hard to find.
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Old 11-14-2019, 01:07 PM   #40
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Our Navigator has 15mm primary lines around the boat and the one larger line from the tank to the pump is 22mm.
I stand corrected...
I believe 15mm is the frequently used size on many boats and inch sizes common for household use.
They are close but not interchangeable
Sorry for any confusion
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