Twin Air 154113DC Dust Cover Fits: KTM 125 EXC 08-11, 125/144 SX 07-10, 150 SX 09-10, 200 XC/XC-W 08-10, 250 SX/SXF 07-09, 250 XC 08-09, 300 XC/XC-W 08-10, 400/530 XC-W/EXC-F 10-11, 450 EXC/XC-F 08-09, 450 SX/SXF/EXC/XC-F 2010, 450 SXF 07-09, 505 XC-F 08-10, 530 XC-W/EXC 08-09 + more Fit this over your Twin Air filter when your riding in severe conditions such as heavy dust and sand This coarse foam pre-filter will act as an additional layer of protection Extends the service time between filter cleanings Designed for use with Twin Air air filters