Hello! I received this skimmer from an acquaintance and it looks rather old. However, since it was free I’d like to see if I can use it. I’ve noticed it is missing some pieces. I haven’t taken the time to clean it yet either. I just want to know what model it is so I can see if I can run it on my 75 gallon tank. I’ll buy a gate valve and air silencer/tube for it if it will work. A little background, it was used for a 180 gallon tank (that’s really all I know) I don’t have a lot of experience with them and I’m having some trouble ID’ing it. Thanks in advanced.