There are several kinds of threaded seals.

There are many methods of thread sealing, which are beyond the reach of high technology. Let's talk about common pipe thread sealing.

one. Hemp-thick paint, this is the most traditional.

second, PTFE raw material belt.

third, sealant.

fourth, if the internal and external threads are made of steel and copper, as long as they are tightened, no sealing material can be used.