[2001Blazer4x4]

So what do I need?

You're killing me!

 

[2old2fast]

Permatex thread sealer with Teflon about $10 .

 

[joshbarnett]

Permatex thread sealer with Teflon about $10 .

Isn't this it?

https://www.summitracing.com/parts/PTX-80632

 

[BogiesAnnex1]

That should work.

Bogie

 

[eric32]

When using that stuff I let it sit for a few days to cure up good enough and don't let any fluids make contact with it. I like to make sure its cured good first before adding any antifreeze to the system.