TUFFLOK is where strength meets simplicity. Our code-listed, mechanically attached fittings eliminate the need for heat and deliver secure, professional-grade connections in AC&R systems. Every fitting is tested for performance, safety, and reliability so installers can trust every joint. For over seven years, TUFFLOK has helped HVAC professionals achieve faster, cleaner, and more dependable installations. Smart Design. Seamless Integration. Total Control. That’s TUFFLOK.