Aeromotive In-Line Marine Filter - AN-12 - 40 Micron SS Element - Black Hardcoat FinishAN 12 40 micron stainless steel element, black anodize finish. An inexpensive insurance policy to protect your investment, proper filtration is key to fuel system performance. Engineered filter solutions are required to achieve protection with minimum restriction. For 200 ? 3,000 plus horsepower applications, our filter assemblies offer unmatched flow, ease of installation and maintenance, and the impeccable machining and finish you? ve come to expect