Replacement Air Filter - Briggs and Stratton 3940
- Contains air filter and pre-cleaner filter OE # 271271
- Fits Briggs & Stratton 12.5-20 hp twin cylinder L head vertical shaft engines, series 402700 and 421700
- Replaces OE # 394019
Specs & Pledge
Shop with Confidence
Avoid frustration when buying parts, attachments, and accessories with the Troy-Bilt Right Part Pledge. If you purchase the wrong part from Troy-Bilt or a Troy-Bilt authorized online reseller, Troy-Bilt, or your Troy-Bilt authorized online reseller will work with you to identify the correct part for your equipment and initiate a free exchange. See full terms and conditions.
Fast, Free Shipping
Parts orders over $50 ship free.*All orders placed before 5 pm ship next day. Standard shipping averages 3 business days for delivery. Expedited shipping is available.
*Some exclusions apply. Read full shipping policy.
Hassle Free Returns
We'll make sure you get the right part. Enjoy 90-day returns for unused parts and we won't penalize you for ordering the wrong part when you follow our return policy.*
*Some exclusions apply. Read full returns policy.
Chat with Experts
Our outdoor power equipment experts are just one click away through Live Chat. Available Mon-Fri 9am - 7pm EDT.
Phone support also available: