Best Of

@BobC i think this was it. I also tightened it way tighter than I typically would ever do for a vent (probably risky). No screeching on this last test. I also think due to factory variation or something the vent-rite just couldn’t get in there snug enough but the MOM seems to be working.

@Tezak Good news, looks like you are on to finding the source of the problem! Good thing it isn't a hole/crack somewhere else as that would be much larger inconvenience.

Although it is annoying to get a refurbished radiator that you need to put some effort towards, a little extra teflon is probably better than shipping it back and forth for another one.

I'd go for some thick teflon tape and as others have said….go nuts with it. Maybe some pipe dope too for good luck.

I can't necessarily address pricing, but a company I work with I believe sells several thousand used radiators a year here in Chicago. He's completely reinstalled all the radiators in many multi-unit buildings that are being brought back after sitting abandoned and all the radiators were stolen.

I think I’ll try running it with a plug in the vent tapping next and see what happens

My thought was that if there’s a hole I may hear air escaping