Particle Filter For 10 Liter Opti-Max Oxygen ConcentratorSKU: 3125US$8.00PriceQuantity*Add to CartPRODUCT INFOReplacement Particle Filter for 10 Liter Opti-Max Oxygen ConcentratorRETURN & REFUND POLICY30 Day Return Policy if unused and in original packaging.5% restocking fee. Customer must pay all shipping costs for return of items.SHIPPING INFOGenerally ships within 2 to 3 days of ordering (business days). 5 to 7 days transportation time.