The new 5-in. forged Super Hevi-Duty High Pressure Coupling is rated for 300 bar or 4,350 psi working pressure. The coupling is assembled with 7/8-in. Grade 8 bolts and nuts and will fit all 5-in. Hevi-Duty weld end applications. The Super Hevi-Duty can be used in high-pressure pumping and extreme applications.