No, the P8 has both the gasket and diaphragms but also includes the fulcrum arm, inlet valve, inlet tension spring and welch plugs. You would use this if you are having issues with the carburetor not holding pop-off pressure or if it's not popping off between 8.5-10psi. The P6 is only the gasket and diaphragms which are replaced more often to maintain the carburetor's performance.
