I am a retired plumber.
Cone seals are cheap.
If you have problems sealing the cone seal you can add pipe dope, in small amounts, to the pipe at installation. Not to the threads, but to the pipe where it slides into the adjoining pipe/cone washer. Which is where the pipe joint will leak. Make sure everything is lined up well.
When installing, use hand strength to secure. If that isn't enough pressure use a channel lock pliers to increase pressure.
Last resort is to use silicone, since it will seal-but much harder to take apart the next time.
Use plastic piping not metal fittings.
If it is sealed well, don't mess with it.
steve
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