Designed for use with the following hose styles: A6/DR6, DR17, B7/DB7, DR2, DR12, DFL, DR16, GL/DGL, DR1, NX6/DR13, NR7/DR7, NR7E/DR7E, T1/DR14, U4/DR4 and Y9/DR5. Dayco® Permanent Crimp Couplings are one piece steel, aluminum or brass material. Typically, permanent crimp couplings are used in a wide variety of applications, ranging from low-pressure refrigerant applications to high-pressure hydraulic lines on off-the-road construction equipment, machine tools, farm equipment and marine equipment. Available in coupling styles 78, 91N, PG, AB and DC.