The psu plant engineering services department recommends replacement of a dielectric union with a dielectric nipple shown below.
Dielectric union leaking.
Their experience is that simply tightening th union fitting is not a durable repair.
Leak at dielectric union.
Hello tomorrow will be day 2 in my venture to change out a water heater.
Screw on the galvanized half of the dielectric union and tighten it using a wrench.
In addition all flanged unions used on larger pipe sizes are gasketed.
When i started it was code to install dielectric unions everywhere in houses where copper connects to steel.
Unions rather than 3 4 copper female so as it would be easier to take out if.
I decided on the d.
I am a licensed plumber for 20 plus years.
If the union is joining copper and galvanized steel pipes it should be a dielectric union.
3 slide the union nut onto the 3 4 inch copper pipe that you are going to connect to the heater with its threads.
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You have lived a very sheltered life my friend.
I have never seen a gasketed union.
If so it has a rubber washer inside and may be leaking because the washer is cracked or worn.
Pennstate university s experts have noted dielectric union fittings may be leak prone.