Liquid teflon tape. That stuff is good.

It comes in a little squeeze tube, just squeeze a bit on each threaded joint then screw together and give it half an hour. Nothing will ever leak again.

You can buy it from bearing shops and hydraulic shops etc.

 

Actually you can get it from Home Depot. It's called pipe dope or pipe sealant.

 

There's lots of sealants you can buy anywhere, some MUCH better than others.

Generally the high end products cost more and are harder to find, but are always stocked by shops that supply the pro industry like bearing shops and hydraulic accessory shops.

 

The local stuff is great. Never had a leak using it. Teflon tape will seal the pipes too.

 

I like Teflon tape because it has bulk to tighten up wallowed out threads, but red Lok-tite works wonders, too.
Both of which I have in stock.

I have 3 kinds of thread-helper paste, but they don't add bulk or harden.