Brass Pipe Fitting, 1 Inch Coupling

Brass couplings like this one are precision-machined so the threads fit tight enough to hold a seal on their own. No thread sealant is needed, which cuts down on prep time and keeps things cleaner during install. That said, if you are working in a particularly high-vibration setup, some folks still add a wrap of tape out of habit, but the fitting is built to work without it.