K&N 59-5006 K&N Marine 3.75in Flange ID x 3.75in Top OD/4.5in Base OD x 4in H Round Tapered Flame ArrestorK&N 59 5006 K&N Marine 3. 75in Flange ID x 3. 75in Top OD 4. 5in Base OD x 4in H Round Tapered Flame Arrestor The K&N Flame Arrestor makes the best air filtration technology available for marine engine use. Marine application owners can experience the increased horsepower and engine protection provided by K&N's oiled cotton gauze and epoxied screen filter element. For high performance on the water, K&N Flame Arrestors will help you fly. Marine