K&N Engineering · New
K&N 1 Gallon Heavy Duty DRYFLOW Cleaner
MPN 99-0638 · Store SKU knn99-0638
Supplier stock checked 11/7/2026, 10:14:21 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
K&N 99-0638 is a 1 US gallon container of K&N Heavy Duty Air Filter Cleaner. It is the only cleaner recommended for cleaning heavy duty commercial grade air filters. This cleaner can be used to clean K&N heavy duty air filters for large turbo diesel engines, class 6-8 over-the-road trucks, agricultural and earth moving equipment, and diesel motor homes. The 99-0638 air filter cleaner will bring your K&N heavy duty air filter to like new condition. It works to dissolve dirt and grime caught by the hybrid filter material and, then it can be rinsed out with a hose or pressure washer. K&N's heavy duty air filter cleaner helps break down dirt and grime caught by the hybrid filter material so it can be rinsed out with a hose or pressure washer. Comes in a 1 gallon container. Heavy Duty Filter Cleaner, DryFlow 1 gal, 128 oz Heavy Duty Filter Cleaner; DryFlow 1 gal; 128 oz CLEANER; H/D DRYFLOW 1 GAL; 128 OZ
Manufacturer fitment & guides
Check 99-0638 against the manufacturer’s application information below.
- Material Safety Data Sheet ↗
- Material Safety Data Sheet ↗
- Material Safety Data Sheet ↗
- Material Safety Data Sheet ↗
Part-specific notes
- Ground shipping only.
- California Proposition 65: Y
Manufacturer documents
- Material Safety Data Sheet
- Material Safety Data Sheet
- Material Safety Data Sheet
- Material Safety Data Sheet