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Old 03-04-2021, 08:35 PM   #1
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15mm Pex Fresh Water T fitting source

We are installing a Seagull IV X-1B Basic Drinking Water Purifier under the sink and I have to Tee into the cold water blue Fresh Water systems 15mm hose.

Has anybody had to do this and is there a particular Tee fitting that was ordered that worked good?

Is there a special tool that is needed?
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Old 03-04-2021, 08:43 PM   #2
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The 15mm size is pretty limited source-wise. That's what I have on my boat. Google "John Guest fittings". Cheapest and most reliable source I have found is freshwatersystems.com. No special tools needed. Just make sure to buy the c-clip collar holders.
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Old 03-04-2021, 08:58 PM   #3
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Looks like for me to tap into this hose I need a Sea-Tech 15mm to a 3/8 hose Tee?

Is there such a thing?
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Old 03-04-2021, 09:07 PM   #4
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Looks like for me to tap into this hose I need a Sea-Tech 15mm to a 3/8 hose Tee?

Is there such a thing?
Google the John Guest 15mm fittings. There are lots of different converters/adapters - you might have to jump in two steps.
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Old 03-04-2021, 09:23 PM   #5
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I used an ice maker tap on my cousins Amal Super Maramu but that was a copper line. Not sure if it would work on the plastic supply line.

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Old 03-04-2021, 09:36 PM   #6
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A quick Google search says no to an ice maker saddle.

How about installing a tee then this 15mm to 1/2" adapter https://www.amazon.com/Pipework-Syst...0YI8I59I&psc=1

it's just a few standard fittings from there.

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Old 03-04-2021, 09:59 PM   #7
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Whale makes 15mm fittings.

This is from a few years ago, but gives you an idea. I've gotten them at Fisheries Supply.
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Old 03-04-2021, 10:13 PM   #8
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The Mainships use the 15mm Sea Tech fittings. Here is a good source for them.

https://www.suremarineservice.com/Ha...ttings-Tubing/
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Old 03-05-2021, 08:09 AM   #9
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we did this exact installation on our pdq powercat. whale makes fittings for 15mm which is what we used. defender carries them.

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https://www.defender.com/search.html...ect%20plumbing
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Old 03-05-2021, 08:52 AM   #10
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Thanks, did you use the supplies 3/8 hoses or did you have to modify something?
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Old 03-05-2021, 09:09 AM   #11
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we used their hoses, etc. we used their faucet as our drinking water source. only hard part was getting right angle to screw on to bottom of faucet.

we've had this setup for 17 years. if i were to do it again i think i'd inline right after system water pump. filter has capacity and then you've got drinkable water at every tap.

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Old 03-05-2021, 01:49 PM   #12
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Freshwatersystems.com carries all of the fittings you will ever need for 15MM "pex" both from sea tech (now watts aqualock) and John Guess.


I'd use a fitting like this, and put a 1/2" fully threaded male tailpiece in it.


https://www.freshwatersystems.com/pr...1-2-nps-branch


They may make a t with a 1/2" male fitting built into it, I'm not sure. But the one above will work and the tailpieces are easy to find at WM or probably the hardware store.
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Old 03-05-2021, 02:04 PM   #13
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... both from sea tech (now watts aqualock).
Ahh, thank you for mentioning this. I was going to add "Seatech" above (in addition to Whale), but then couldn't remember which company they had merged with. Watts!

(I could have looked it up but was apparently feeling lazy.)
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Old 03-06-2021, 12:11 PM   #14
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Originally Posted by jefndeb View Post
We are installing a Seagull IV X-1B Basic Drinking Water Purifier under the sink and I have to Tee into the cold water blue Fresh Water systems 15mm hose.

Has anybody had to do this and is there a particular Tee fitting that was ordered that worked good?

Is there a special tool that is needed?
You need this https://www.marineoutfitters.ca/inde...e=840213133573
Then This with a short piece of 15MM pipe
https://www.marineoutfitters.ca/inde...e=840213133467
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Old 03-06-2021, 01:42 PM   #15
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jefndeb,

attached is a pic of our installation. as dougcole said, i used the screw on tee. hope this helps.

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GEM 2003 P34
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Old 03-06-2021, 10:05 PM   #16
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Thank for the info....

Can you explain how you connected these two fittings you referenced?

And wouldn't I need this adapter brass to connect the 3/8 hose to it?
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Old 03-07-2021, 08:16 AM   #17
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Much simpler to use this one:


https://www.freshwatersystems.com/pr...1-2-nps-branch


You can screw the nipple directly into it, then attach the female fitting from you filter to the nipple. Less connections than using the fittings in your above post.


I just installed an under sink water filter in our 400, though not one as nice as the seagull. The biggest challenge is that there is not a lot of room for the stiff pex style hose to flex, which puts strain on the connectors and can cause them to leak. Go with as few connections as possible.


I ended up using plain old fashioned barbed tailpieces, hose clamps and about 2' of regular fresh water hose from the outlet of my fliter up to the faucet because it is so much more flexible than the pex. It looks to me like you won't have to do that though, as the seagull comes with a flexible hose from its outlet side.
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Old 03-07-2021, 05:44 PM   #18
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Yes, thanks but the hoses for the Seagull are 3/8, (female) so thats why I was looking at the 1/2 to 3/8 adapter...am I misunderstanding?
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Old 03-08-2021, 08:05 AM   #19
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Yes, thanks but the hoses for the Seagull are 3/8, (female) so thats why I was looking at the 1/2 to 3/8 adapter...am I misunderstanding?
Yep so you put a piece of 15mm pipe between T and 1/2" adapter then your reducer attaches to 1/2" adapter
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Old 03-08-2021, 08:08 AM   #20
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Yes, thanks but the hoses for the Seagull are 3/8, (female) so thats why I was looking at the 1/2 to 3/8 adapter...am I misunderstanding?
Last comment I had the seagull on a couple of boats Cartridges are proprietary and very expensive I switched to a Rain fresh from Loews, Cartridges are $10.00 and works as well if not better than seagull. also has an adapter that pins the tubing and clamps to the pipe. great system, and easy to bypass when winterizing
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