TQC Coupler - Tube Clamp Tube Quick Connect Coupler is designed for easy installation on the end of straight tubing. Slide the coupler on to the end of straight tubing until seated and push down on the Mechanical lever to make a positive seal. A cam locking device grips properly without damage to Steel, Copper, Brass or any metal Tubing. Can be removed from the Tube for operator safety and blow off or loss of seal connnection by accidental