I want to disconnect the supply line near the toilet tank, and cannot unscrew it by hand, it does not seem to be in the shape (rounded nut) that a adjustable wrench could work , what should I do?

http://oi42.tinypic.com/6fp448.jpg

Attack it with a pair of pliers. Good luck, Tom

Thanks - seems like I need to get a pair of big pilers to fit the size, should I look for any specific pilers?

Water pump pliers.

Chuck

Awesome- thanks!

Here is a picture of a Water pump pliers, Thanks.

John

Even a pair of slip joint should work.

More commonly known as channel locks. I always call them pump pliers too. Channel locks is just a brand name.

Thank you all - the pump pilers was exactly what I needed!

We're just glad you finely got the nut off. Tom