I had to replace the trap in my kitchen sink, and when I did that the pipe that goes to the drain broke. So now I'm trying to replace that darn thing. It's stuck. It's metal, looks like chrome maybe? Silvery. I tried some CRC multi purpose silicone stuff, still stuck. Found some STP stuff too, it said nothing about pipes but it had stuff in it like I heard stuff for pipes did, so I tried it anyway. Let it sit for 15 minutes, nothing. I'm going to get PB Blaster or something at my Orscheln's, we'll see.