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Threaded Pipe Fittings of Different Materials

Threaded Pipe Fittings of Different Materials

Threaded Pipe Fittings of Different Materials

(OP)
I have an aluminum filter housing that needs to connect to a pumped drain system made of copper.  When the system is in use, it will operate at about 140F.  Thread size is 2" NPT.

What connection should I make between the two materials?  I'm concerned about threaded joint leakage due to differing expansion coefficients, as well as possible galvanic action.

---KenRad   

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