AIR FILTER COMPATIBLE WITH: BLOWER MODELS: PB 251 PB251 PB 255 PB255 PB 265 PB265 COMPATIBLE WITH: BRUSH CUTTER MODELS:SRM 280 SRM280 PRE-FILTER CODE: BM 046490 78X78X9.5 ECHO - KIORITZ - HOKKAIDO Code:046450 Original code:A226000350 A226000351 A226000470 A226000472