dialectric union

11-02-2008, 01:53 PM	#1
amakarevic Member   Join Date: Apr 2007 Posts: 2,069	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.

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11-02-2008, 02:01 PM	#2
nap You talking to me?     Join Date: Dec 2007 Location: sw mi Posts: 5,407	dialectric union 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.

11-02-2008, 02:58 PM	#3
majakdragon Member   Join Date: Sep 2006 Posts: 1,670	dialectric union 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. __________________ If you have never made a mistake, you haven't done much.

11-02-2008, 03:06 PM	#4
nap You talking to me?     Join Date: Dec 2007 Location: sw mi Posts: 5,407	dialectric union Quote: Originally Posted by majakdragon 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...

11-02-2008, 03:22 PM	#5
majakdragon Member   Join Date: Sep 2006 Posts: 1,670	dialectric union 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. __________________ If you have never made a mistake, you haven't done much.