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Old 08-10-2021, 17:57   #1
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Help identifying plumbing fittings?

Replaceing the plumbing for the domestic water. Has gray plastic tubing with od of 1/2 inch and a compression fitting with a shield logo on them. Does any one know what these are? And where to get more?
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Old 09-10-2021, 03:53   #2
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Re: Help identifying plumbing fittings?

Can you see them here?


https://www.google.com/search?q=gray...&bih=615&dpr=1
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Old 09-10-2021, 06:38   #3
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Re: Help identifying plumbing fittings?

Here you go

https://www.plumbingsupply.com/polyb.html
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Old 09-10-2021, 21:13   #4
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Re: Help identifying plumbing fittings?

Looks like my boats plumbed w 3/8 polybutylene (spelling). I can get a sharkbite to go up t0 1/2" . Then redo the whole boat in 1/2. Pex. Will this cause a pressure drop in my faucets?
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Old 10-10-2021, 09:19   #5
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by Mg451 View Post
Looks like my boats plumbed w 3/8 polybutylene (spelling). I can get a sharkbite to go up t0 1/2" . Then redo the whole boat in 1/2. Pex. Will this cause a pressure drop in my faucets?
If you go up in size from 3/8 to 1/2 inch, your plumbing will have less resistance to flow, not more. If anything, you should see more pressure at your faucets.
This is the direct analog of increasing wire size to decrease voltage drop.
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Old 10-10-2021, 09:46   #6
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Re: Help identifying plumbing fittings?

You can even find 15mm PEX. Our H38 came factory supplied with 15mm PEX red and blue tubing and Seatech push fittings.
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Old 10-10-2021, 09:47   #7
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Re: Help identifying plumbing fittings?

Looks the same on my boat, the PO had literature identifying them as "Quest" parts. Web search for "Quest plumbing" shows what looks to be the same stuff as you posted.
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Old 10-10-2021, 11:37   #8
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Re: Help identifying plumbing fittings?

That’s PB or polybutelene. I am replacing mine with 1/2” Pex and Watts Aqua Link fittings. They are the same as shark bite with a couple of differences.

Does anyone know the thread type that was common to PB elbows. I have a water tank connection that I want to use with my new fitting without removing it from the tank. I am wondering if it’s a match for the Watts Aqua fittings.
Mike
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Old 10-10-2021, 11:54   #9
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by Mg451 View Post
Replaceing the plumbing for the domestic water. Has gray plastic tubing with od of 1/2 inch and a compression fitting with a shield logo on them. Does any one know what these are? And where to get more?
Looks like poly butylene to me. The fittings were junk. Today PEX has replaced it.
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Old 10-10-2021, 12:31   #10
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by AndyEss View Post
If you go up in size from 3/8 to 1/2 inch, your plumbing will have less resistance to flow, not more. If anything, you should see more pressure at your faucets.
This is the direct analog of increasing wire size to decrease voltage drop.
Not to be pedantic but you are confusing volume (amperes) with pressure (voltage). The static pressure will remain the same but the volume should increase at the delivery point.
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Old 10-10-2021, 13:49   #11
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by AndyEss View Post
If you go up in size from 3/8 to 1/2 inch, your plumbing will have less resistance to flow, not more. If anything, you should see more pressure at your faucets.
This is the direct analog of increasing wire size to decrease voltage drop.
Think of it like having a small garden hose vs a larger garden hose, with a larger hose you will notice you get more water (volume), pressure loss will be less as well, but not as noticeable. (see attached chart).
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Old 10-10-2021, 14:00   #12
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by pitlaw View Post
That’s PB or polybutelene. I am replacing mine with 1/2” Pex and Watts Aqua Link fittings. They are the same as shark bite with a couple of differences.

Does anyone know the thread type that was common to PB elbows. I have a water tank connection that I want to use with my new fitting without removing it from the tank. I am wondering if it’s a match for the Watts Aqua fittings.
Mike
I would hazard a guess it is NPT since it was used primarily for household plumbing.
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Old 10-10-2021, 15:49   #13
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by pitlaw View Post
That’s PB or polybutelene. I am replacing mine with 1/2” Pex and Watts Aqua Link fittings. They are the same as shark bite with a couple of differences.

Does anyone know the thread type that was common to PB elbows. I have a water tank connection that I want to use with my new fitting without removing it from the tank. I am wondering if it’s a match for the Watts Aqua fittings.
Mike
Any PB fittings I've used have standard NPT (same as old steel pipe) threads. Readily available at any plumbing supplier, HD, Lowes, etc.
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Old 10-10-2021, 16:52   #14
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Re: Help identifying plumbing fittings?

Quote:
Originally Posted by AndyEss View Post
If you go up in size from 3/8 to 1/2 inch, your plumbing will have less resistance to flow, not more. If anything, you should see more pressure at your faucets.
This is the direct analog of increasing wire size to decrease voltage drop.
As long as the opening is 1/2" at the outflow of the faucet, you would have more flow but less pressure.
https://www.pipingmart.com/blog/othe...ater-pressure/
The pipe size and water pressure:
The variations in pipe diameter will not affect the static pressure. When the connection is open, the water pressure moderately decreases. The larger pipe offers minimum resistance to flow, and hence the water pressure decreases.
SV Cloud Duster
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Old 10-10-2021, 18:19   #15
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Re: Help identifying plumbing fittings?

Pex is a remarkable product, and can make a good system.
However, depending upon the actual installation it can have lower flow rates than the same size vinyl hose it replaces.
While hose can be "snaked" around and about various obstacles, if you have to use a bazillion fittings to install Pex, the flow rate (for the same pressure,) will decrease.
Granted, with some planning this can be minor issue,, just something to be aware of.
The most reliable and trouble free water pressure systems will have Large Lines and Low Pressure.
If the main lines can be 5/8ths or 3/4s, with just short connections of smaller line to the individual faucets, etc. you will enjoy good flow rates without resorting to high pump pressure.
If building new, or doing a complete replacement, going larger than 1/2in. is highly recommended.
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