In new construction where more careful code compliance and enforcement are applied dielectric or brass fittings are more common.
Dielectric connection water heater.
The adapter is used to connect pipes of different types together for example a copper pipe and iron pipe.
If either the tank nipples or the pipes are galvanized steel however and you are connecting them to copper you must use a fitting called a dielectric union to make the connection.
A dielectric union fitting is one which is often used in water supply lines and other connections which require an adapter to be placed between two different pipes.
Screw on the galvanized half of the dielectric union and tighten it using a wrench.
Water chemistry affects the rate of galvanic corrosion.
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Some plumbers opine that lined nipples sold by some manufacturers for water heater hookup reduce the galvanic corrosion risk at those connections.
This video details how to replace the dielectric unions nipples of the water heater that make up the hot and cold connections coming from and going to the wa.
Fip x 3 4 in.
Stainless steel corrugated water heater connector.