I AM MECHANICAL DESIGN ENGINEER WITH 10 PLUS YEAR EXPERIENCE IN HYDRAULIC PRODUCT,MACHINE AND POWERPACK DESIGN. THIS COUPLING DESIGN FOR OUTER SPACE TECHNOLOGY FOR REFULING WITH MINIMUM FUEL LOSS AND SIMPLE FOR CLAMP AND UNCLAMP APPLICATION . DESIGN IS CAPABLE FOR ALL SPACE APPLICATION WHWERE RE-FUELING IS MOST IMPORTANT. SOME KEY FEATURE HERE, 1. EASY TO MANUFACTURE 2. MINIMUM FUEL LEAKGE. 3.HIGH TEMPERATURE SEAL USED IN THIS DESIGN FOR HIGH TEMP. APPLICATION 4. EASY CLAMP DE-CLAMP MECHANISM. 5.SUITABLE FOR ALL LOW PRESSURE FLUID.