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-   -   dialectric union (http://www.diychatroom.com/f7/dialectric-union-31076/)

amakarevic 11-02-2008 12:53 PM

dialectric union
 
is it necessary to apply dope on the threading of a dialectric union, since there is a gasket ? i am not talking about the threading that joins on the galvanized pipe, that, of course, does need it.

nap 11-02-2008 01:01 PM

the threading?

Do you mean where the one half screws into the other half and that holds the flat surface with the gasket together?

If so, then no. Those threads only serve as a means to tighten and hold the flat surfaces together. They provide no sealing means themselves.

majakdragon 11-02-2008 01:58 PM

Although the nut is not a sealing connection, I always use either pipe dope or Never-seez on these threads. If you ever need to take the union apart, it will be a lot easier.

nap 11-02-2008 02:06 PM

Quote:

Originally Posted by majakdragon (Post 179883)
Although the nut is not a sealing connection, I always use either pipe dope or Never-seez on these threads. If you ever need to take the union apart, it will be a lot easier.

Maybe anti-seize although this also makes the threads so they do not lock as well and may loosen but I have found that pipe dope makes them more difficult to take apart in the future. I suppose it depends on what type of dope you are using but my experience...

majakdragon 11-02-2008 02:22 PM

In my experiences, I have never had a union come loose and either product is easier for nut removal than calcium deposits later. To each his own, but I have always lubricated the nut threads on unions.


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