* Free Ground Shipping applies to online orders of US$500 or more with a shipping address in the continental United States. Offer applies to VBMax PFT Filters, ViroMax Filters, HydroMax HME Filters, VBMax PFT Kits, Calibration Syringes, Nose Clips, Pediatric Mouthpiece Adapters, Disposable Rubber Mouthpiece, Reusable Mouthpieces, Breathing Circuits, FlowMIR Disposable Turbine, Face Masks, Breathing Bags, Mouth Seals, and Paper Mouthpieces. Cannot be combined with any other offer. Promotion ends on December 31, 2021.