Mercury - Engine Air Filter 2-Stroke 115-225HP DFI, Jet & Pro XS Outboards Pleated, Self-Gasketed Design 853333T. Overview. There's a certain kind of confidence that comes from knowing your engine is breathing clean, unrestricted air. The Mercury Quicksilver 853333T Engine Air Filter delivers exactly that - dependable protection that keeps your Mercury or Mariner outboard running smooth, strong, and responsive every time you hit the water. When the wind's at your back and the throttle's down, yo