Mercury - Tow N Stow Outboard Cover FourStroke Series Polysoft II Marine Material 8M0228537. Overview. There is a certain calm that settles in when you know your engine is protected before you even hit the road. I have slipped this Mercury Tow N Stow Cover over more than a few FourStroke engines, and every time, it feels like I am doing right by the motor that gets me home. You tug it into place, hear the soft pull of the fabric settling in, and you know the cowl is shielded from whatever the da