Wrap threads with Teflon tape + pipe dope, or use a thread repair kit (like Heli-Coil) for a permanent solution.

Pressure-balanced valves maintain consistent temperature by adjusting water flow, while thermostatic valves allow precise temperature control - installation complexity differs between models.

Try a flexible plastic drain snake or use a wet/dry vacuum to suction out the clog. For stubborn bends, remove the P-trap under the sink first.