METAL QUICK DISCONNECT COUPLERS AND QUICK CONNECT COUPLERS, NAMELY, COUPLERS HAVING MALE HALFS AND FEMALE HALFS, COUPLERS FOR STIFF AND FLEXIBLE PIPES, TUBES AND TUBING, HOSE COUPLERS, COUPLERS FOR HYDRAULIC APPARATUS, HYDRAULIC QUICK RELEASE COUPLERS FOR HIGH PRESSURE HOSES, GENERAL PURPOSE HYDRAULIC COUPLERS, LOW PRESSURE COUPLERS, HIGH PRESSURE COUPLERS, THREADED COUPLERS, DRYBREAK COUPLERS, AND FLUSH FACE COUPLERS