What is a good heat resistant sealer?

What will be distilled?

If you’re using a screwed connection, then teflon tape should be a good sealant for the threads. It’s non-reactive and suitable for high temperature use.

Not being familiar with the distilling process or equipment, I have to wonder if there’s a gasket that would work for the lid. You’re not expecting some sealant to make a leakproof mechanical seal, are you? If you have a silicone gasket for the lid and mechanical fasteners, then you should be good to go.

@Adirondackwannabe -I am going to extract essential oils from flowers…or that is what I think I am going to do…;)

@WasCy -I was expecting that,and so much more!

So the temperature’s not going to be too much higher than canning, some of those materials might work for the lid. The teflon tape would work well for the tubing, it’s in plumbing supplies, or even lead free solder would work, but it’s a little overkill.

You could do this all with glass parts designed for such applications, but maybe those are too expensive. I’ve done tons of distillations as a chemist, so let me know if you want a simple design that is guaranteed to be effective.