I got a new faucet and began removing the old one. I got the new one in the hole, but now it's time to disconnect the hot and cold water hoses from the old faucet and replace with the new ones attached to the new faucet. Only problem is I can't get them off. I've turned left, I've turned right. Both with a wrench and by hand. I can't seem to find online what kind of fittings these silver things are and how to remove them. Please help! I've attached a picture for identification. I'm scared to turn my house water supply back on until I figure this out. Thanks in advance!