Homelite Ryobi Part 521852001 used in models UT09521 26cc Blower, UT09520 26cc Blower, UT09523 26cc Blower, UT09525 26cc Blower, UT09526 26CC Blower, HOMELITE RYOBI 521852001 GENUINE Air Box Cover REPLACES ALSO USED ON RIDGID TROY-BILT ECHO POWERSTROKE WORKFORCE BLACKMAX