10:16AM | 11/16/02
Member Since: 11/03/02
3 lifetime posts
i am trying to cap a hydronic system that is the mode of heating for my home, where the radiator would be. the problem is a leak where i am trying to cap a water line. the materials are brass. i don't know the terminology so bare w/ this description.

I've been told to cap the elbow piece that comes out of the floor. this elbow requires a pipe with standard thread, on to which a cap can be screwed, having standard threading. since the elbow piece has a non-standard thread i decided to buy the pipe. the end that goes into the elbow is male and has a rounded edge so that it seats against the 'female' interior wall of the elbow (like a ball and socket). the seal, it appears, is made when a nut around the pipe is tightened, thus pressing the tube into the 'female' elbow. the leak comes from this union.

what solutions are there for the leak myself?

can i use the putty that hardens on the brass? on the exterior surface of the nut, at the seams? Thanks for your help.


08:08AM | 11/27/02
Member Since: 11/17/02
50 lifetime posts
What you're referring to is a radiator elbow. It is a union type elbow that attaches to the radiator. If this is leaking, you should be able to disassemble it and reinstall it using a small amount of pipe dope on the face. If you're trying to cap off the radiator, you need to remove this fitting completely and install a regular cap on the nipple coming out of the floor with pipe dope.
Harveys or Rector Seal works good for the pipe dope.
Good Luck
Master Plumber

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