Pressure relief valve

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I've always used teflon tape on the threads.
It's not supposed to be needed when using soft brass threads in soft aluminum sidewalls, but I always apply either teflon tape or plumbers putty.  Can't hurt as long as it is rated for hot water use.
I also use a teflon tape on all of those kinds of connections.  Not only does it add a bit of mental security to having made a good seal, I think the threads mesh a bit smoother and makes the connection a smoother operation.
Pipe threads are tapered and intended to be metal/metal. Teflon tape adds little to a seal, but acts as a lubricant to allow the male to enter further. However, a seal will only occur if the tape is cut by the threaded parts, allowing metal/metal contact.

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