These reducer adapter hose fittings are designed to quickly make converting female connection to male. Designed for smooth flow that gives better fluid flow, tight security, and leaks free connection. Multi Sizes Supplied: Female AN6 to Male AN4. ( NO INSTALLATION INSTRUCTIONS, Professional installation is highly recommended.) APPLICATION-SPELAB Flare Reducer Hose Fitting is widely used in Oil/ Fuel/ Water/ Fluid/ Airline etc. The hose reducer fittings are made of high-quality aluminum alloy material for strong strength. Anodised and hand polished finish adds the final touch of quality and protection. ENVIRONMENTAL FRIENDLY- Flare Reducer Fitting can be reused and recycle if you do not want them to stay in the original place. Due to the high-quality material which makes fitting worked last for a long.