2 PK Felt Pad Air Filter Fits Stihl 4237-120-1800 HS81 HS82 HS86 HS87 by Rotary $15.98 Sold out 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out PRODUCT INFORMATION Type Air Filter PRODUCT DESCRIPTION Brand New 2 PK Felt Pad Air Filter Fits Stihl 4237-120-1800 HS81 HS82 HS86 HS87... Genuine Rotary Part # 12785