I have a water supply valve that supplies water to the toilet. The valve is not made with a removal flex line fitting. Instead it has a galvanized flex tube that is a valve and tube combo (1 piece) with a valve shutoff handle. You can see where I am going with this...
I want to change it out (since it leaks now after bending it too many times of trying to get it to fit right.. anyway, am I going to have to cut the valve at the feed line from the wall to replace it all. Or can I just get a rubber hose and clamp it all real tight and put another rubber hose on the end I cut off and attach my new flex hose to the toilet? What can I do here to just get the new flex line to the toilet without the leak?

Thanks.

I'd replace it all. Putting a 'band-aid' on it may eventually start leaking again.

XenoSapien

Can you post a pic?

No rubber hoses, you need to use proper plumbing connections, like braided stainless hoses. There should be a fitting at each end, unfasten them, and the new replacement should connect to the shutoff and the toilet.