Air Filter, For Use With Grainger Item Number 458K09, For Use With ID0502A, ID0503W, ID0592N, IDT0450A-161, IR0520A, IR0521W, IR0590N, IY0504A, IY0505W, IY0594N, IYP0504A, Mfr. No. SY0504AP, RFC0985, SD0502A, SD0502AP, SD0602AP, SF0906A, SF0907W, SF0976C, SN0958A, SN0959W, SN0978C, SR0500A, SR0500AP, SY0504A, SY0604AP