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08-10-2021, 17:57
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#1
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Registered User
Join Date: Sep 2021
Posts: 159
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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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09-10-2021, 03:53
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#2
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Registered User
Join Date: Dec 2009
Location: Australia
Boat: BUILT!!! Roberts Mauritius 43ft
Posts: 3,604
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Re: Help identifying plumbing fittings?
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09-10-2021, 06:38
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#3
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,626
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Re: Help identifying plumbing fittings?
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09-10-2021, 21:13
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#4
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Registered User
Join Date: Sep 2021
Posts: 159
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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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10-10-2021, 09:19
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#5
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Registered User
Join Date: Dec 2016
Location: Sea of Cortez/northern Utah/ Wisconsin/ La Paz, BCS
Boat: Hans Christian 38 Mk II
Posts: 948
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by Mg451
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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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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10-10-2021, 09:46
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#6
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Registered User
Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 1,342
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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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10-10-2021, 09:47
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#7
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Registered User
Join Date: Feb 2015
Boat: Land bound, previously Morgan 462
Posts: 1,991
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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.
__________________
No shirt, no shoes, no problem!
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10-10-2021, 11:37
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#8
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Registered User
Join Date: Oct 2009
Location: St Louis, MO
Boat: Nordic 44
Posts: 203
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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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10-10-2021, 11:54
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#9
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Registered User
Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 10,208
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by Mg451
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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Looks like poly butylene to me. The fittings were junk. Today PEX has replaced it.
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10-10-2021, 12:31
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#10
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Registered User
Join Date: Jul 2016
Location: Atlantic Highlands, NJ
Boat: Swallowed the anchor
Posts: 976
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by AndyEss
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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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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10-10-2021, 13:49
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#11
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Registered User
Join Date: Mar 2014
Location: Pacific NW.
Boat: KP 46
Posts: 765
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by AndyEss
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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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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10-10-2021, 14:00
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#12
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Registered User
Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 10,208
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by pitlaw
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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I would hazard a guess it is NPT since it was used primarily for household plumbing.
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10-10-2021, 15:49
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#13
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Registered User
Join Date: Mar 2012
Location: Madeira Park, BC
Boat: Custom steel, 41' LOD
Posts: 1,372
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by pitlaw
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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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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10-10-2021, 16:52
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#14
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Registered User
Join Date: Nov 2014
Location: Olympia, Washington
Boat: 1979 Mariner Ketch 32-Hull 202
Posts: 2,124
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Re: Help identifying plumbing fittings?
Quote:
Originally Posted by AndyEss
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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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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10-10-2021, 18:19
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#15
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Registered User
Join Date: Aug 2021
Location: PNW
Boat: 35 Ft. cutter, custom
Posts: 2,251
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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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