A-528306 Curtain, Safety, InnerOne New Aftermarket Replacement Inner Safety Curtain for New Idea Disc Mowers This inner safety curtain mounts on the New Idea 5209 disc mower and serves as a protective barrier between the cutting discs and the operator area. It is also a direct fit replacement for the equivalent Fits Case IH 3309 disc mower conditioner. The curtain is a flexible rubber or rubber composite shield designed to contain debris and reduce hazard exposure during mowing