Sink Water Lines

[Photolomy]

What size are the copper lines connecting the sink? I am not at the boat and want to pick up a couple of valves to install on the way.

[MadHatter53]

Mine were 3/8.

[metama]

All my lines had 1/2 flare connections.
Possible the hardest thing to work with today.

The line is flex copper not pipe.

Little plumbing reminder:

You can't get a 1/2 female connector/adaptor. You may require:1/2 Female to 1/2 female adapter. With my plumbing.... a number of....

1/2 to 1/2 female
1/2 Male flare to Pipe
1/2 Pipe fitting, to 3/8 compression adapter
value / faucet

Sure- Pipe fitting thread is the same as Flair, but it will trap water and freeze over winter!!

If I had to do it again-
Flex line with manifolds to shut down each run!!!!
Would have cost the same.

[MadHatter53]

Phil I still have a bunch of my old flared connectors, let me know if you need anything.

[oscarvan]

If I had to do it again-
Flex line with manifolds to shut down each run!!!!
Would have cost the same.

Something my moho manufacturer (Forest River) did very right. Should I have need to start replacing water systems, this philosophy would definitely come into play, probably with a brass manifold though.

[Photolomy]

All my lines had 1/2 flare connections.
Possible the hardest thing to work with today.

The line is flex copper not pipe.

Little plumbing reminder:

You can't get a 1/2 female connector/adaptor. You may require:1/2 Female to 1/2 female adapter. With my plumbing.... a number of....

1/2 to 1/2 female
1/2 Male flare to Pipe
1/2 Pipe fitting, to 3/8 compression adapter
value / faucet

Sure- Pipe fitting thread is the same as Flair, but it will trap water and freeze over winter!!

If I had to do it again-
Flex line with manifolds to shut down each run!!!!
Would have cost the same.

Just to make sure I understand. The copper is too soft for a compression fitting? It must be a flare fitting? Also, how bad is the risk for threaded connectors? I don't see a lot of that when searching. Also, my boat is in Florida, but nonetheless, I don't want to set up some future northern owner with issues.

I would like to use flare to thread, then the shut off valve, then a threaded connector to the faucet.

[metama]

I re-did all the fittings last year. Only did one set this year!
So- Im leaving out the exact details that currently escape my memory.

Flex copper tube is a different OD then standard coper pipe.
It's like the bendable copper for a fridge, only larger.

So it limits your options with fitting. You can't just grab a snake bite shut off.

You are going to have one of 2 things to connect to.
A custom made 1/2 to 1/2 flare. (Two female flair fittings on a 2 inch section of copper tube).
Or.
A male 1/2 flair tee.

If you have a 1/2 flair male tee, keep yourself from just putting a non flair fitting on it. Sure you can put a normal Male pipe adapter on it.... but the flair will create stress and let water in around it.
I let someone else fix one sink. Guess what sink I re-did this spring!

And... they don't make a Flair to compression adapter of any kind. So your going Flair to pipe and pipe to compression.

Pipe and Flair have the same thread angle. Compression have a different thread angle.

You can get a 1/2 to 1/2 female pre-made fitting. So you don't need a flair tool to make them. Might not be in your hardware store but amazon has them.

[metama]

"I would like to use flare to thread, then the shut off valve, then a threaded connector to the faucet."

Flare to Flare (if you don't have it all ready)
Flare to Pipe
Pipe to compression (drop from 1/2 to mostly likely 3/8 based on your faucet)
Compression shut off (If you add a shutoff)
Compression to Faucet

Assuming you have room for a shutoff without a 90.

I believe the standard for faucets and shutoffs are compression.
And yes, you are trashing the compression part of the fitting. Faucets are female compression.