New OEM STIHL Pre-Filter 4221-141-0310, 4221-141-0310A | eBay
Wallet -
Daniel's garden maintenance - How to rid your wallet of $500 (discounted $200) , buy a second Stihl power head ... but I can't be a reliable professional without reliable professional tools
Stihl Timbersports Wallet – Skyland Equipment Ltd
STIHL BGA 45 Battery-Powered Handheld Blower - Towne Lake Outdoor Power Equipment