SAS9700-02 / SAS 9700-02 Air Exhaust Filters (6 in box) • High Quality • Designed to keep dust and airborne particles from damaging pump • Replace filters every 90 –100 running hours Caution: These are not air purifying filters. Locate oil-less air pump in clean air environment where breathable air can be assured at all times. Shipping Charges are based on Zone, Weight and Dimensions.