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Old 10-05-2019, 07:31   #1
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Polybutylene

My old boat has 3/8 polybutylene plumbing which has to be connected to regular faucets with threaded hot/cold pipes on 4 inch centers.
There is a transition fitting that goes from the poly boat pipe to the threaded intake pipes on the faucet.
Does anyone know the name of that fitting and where I can find one.? I’m attaching a picture of the broken fitting, the closest vertical fitting with the horizontal crack.
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Old 10-05-2019, 08:25   #2
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Re: Polybutylene

Poly B is notorious for failures especially on the hot water side if things (thermal cycling). You may not even be able to find poly b fittings as a lot of places/insurance have banned them. Personally I’d buy a plex crimper and swap it over.
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Old 10-05-2019, 09:52   #3
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Re: Polybutylene

Thanks. Do you mean i can connect a pex fitting to a polybutylene pipe?
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Old 10-05-2019, 10:08   #4
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Re: Polybutylene

Yes. The polyB is either IPS (iron pipe size) or CTS (copper tube size) as is PEX. Look for a sharkbyte fitting that connects to the outside of the pipe with a grip ring, but all PEX is the way to go.
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Old 10-05-2019, 10:20   #5
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Re: Polybutylene

^^ but get rid of as much poly b as possible.
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Old 10-05-2019, 11:56   #6
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Re: Polybutylene

Can you crimp on the Pipe with hose clamps?
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Old 10-05-2019, 12:00   #7
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Re: Polybutylene

They make fitting that go from copper, threaded etc to pex. You’ll need a pex crimper but they’re relatively inexpensive ($60); Same with pex piping cheap and available at most hardware stores. If you find a hardware store they’ll generally have an entire section dedicated with every fitting imaginable.
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Old 10-05-2019, 12:33   #8
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Re: Polybutylene

Polybutylene pipe fittings:
https://www.plumbingsupply.com/polyb.html

1/2 in. Push-to-Connect Brass Polybutylene Conversion Coupling Fitting
Works on any combination of Copper, CPVC, PE-RT, and PEX Pipe
https://www.sharkbite.com/products/p...ition-coupling

https://www.homedepot.com/p/SharkBit...8LFA/202270632
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Old 10-05-2019, 12:38   #9
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Re: Polybutylene

Thanks
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