DIYorBust
Active Member
So this was a surprise. I have some radiators with four tappings. Normally two would be for flow and return and one would be used for an air vent, the fourth would be capped, but other configurations are possible. The manufacturer confirmed that the tappings are 1/2" NPT, and such NPT fitting thread in. However, I can never quite get them tight. I wonder if there are enough threads on the tapping. Some fittings with longer threaded sections do fit in, but some don't, like street elbows and close nipples. Any idea what's going on here, am I buying the wrong fittings?
Thanks,
DIY
Thanks,
DIY