Help! Installing new faucet problem...

I started to install a new Moen faucet last night and ran into a problem. First of all, the faucet doesn't have typical rigid copper lines with threaded male connectors for the supply lines. Instead, it has thinner, 3/8" rubber-like lines with a female compression nut at the end. And to complicate things, the water supply lines under the sink go directly behind the wall and the connections/shut off valves (if there are any), are inaccessible. And these lines have the typical 1/2" plastic compression nut. So, I imagine I need some sort of coupler. Would it be easier to install a male to male coupler or would it be easier to cut down main water supply lines and install something with a male connector for the female faucet lines? The lines are a bit long to begin with. Thanks in advance.

To help things out, this is essentially what I'm dealing with... on the left is what I have running out of the wall for the main supply lines and on the right is what's on the end of each faucet line: http://www.homedepot.com/catalog/pro...6d77a3_400.jpg

 

The lines on the faucet are designed to directly attach to the typical faucet supply valve.I think what you have is some sort of line that has the 1/2 pipe thread that would fit the outlet of a faucet with no lines attched.You have two choices:easy= there is an adapter available at most hardware stores,Not so easy= create shut off valves if there are none and set it up like a traditional situation with supply valves that have 3/8 comp outlets.

 

I'll opt for the easy route for now and look into adding valves down the road (nice to have). Can you give me the name of the fitting needed for this? I bought a 3/8" male to 1/2" male last night and the 1/2" end fit on the plastic fitting of the mail lines, but the 3/8" end didn't fit correctly on the faucet fitting. It was slightly tapered and wouldn't fit flush with the compression nut.

 

You want 3/8 COMPRESSION to 1/2 pipe.Not pipe x pipe.It will be brass or chrome plated brass and versions of it may be located with compression fittings as well as with supply lines.Pipe thread has a taper compression won't.

If you go to a hardware store where there is good help and tell them what you need it will take anyone with knowledge about 5 seconds to get this for you as this is not that uncommon a situation or fitting.