Air Filter / Ryobi 791-180350 BPack Size:1Ryobi 180350, Ryobi 791-180350 BGreen Line 38887, NHC 207-7158, Prime Line 7-08390, Rotary 8410, Sunbelt WAL-125-48Ryobi GBV28 blowers; 780RE and 790R trimmers; Walbro 125-48 Foam air filter, ID: 1 1/4 ", OD: 2 1/4 ", Height: 7/8 "