HPS Performance -12 AN Female to -16 AN Male Expander Adapter Aluminum AN951-12-16Key Features Side A: AN 12 Female. Side B: AN 16 Male. Expands from female to male. Works with all AN fitting brands with 37 degree flare. 6061 aluminum with Type II black anodizing for excellent corrosion resistance. Compatible with water, coolant, air, oil, and most fuels. HPS AN Adapter Fittings are designed to be used in a variety of applications such as cooling, oil, and fuel. This adapter converts your existing male AN fitting to the next size