All of SUPERLOK Tube Fittings, design and dimension, are the same as LEGACY BRANDS and Parker. So it is fully interchangeable with these brands. Same form, fit, and function. The Nut and body threads of a SUPERLOK fitting OD are constructed in accordance with ASME B1.1 and the thread tolerances are controlled as specified in ASME B.1.1. This strict tolerance ensures a consistent make-up every time. As proof, we have attached the “SGS intermix-ability & interchangeability burst-test certificate.