BBaby Mucus Extractor, Nasal Aspirator From Dr. Natural Healing. Patented Anti-backflow Valve, Doctor Designed and Patented. No Sucking, So No Filter to Buy or Use. ReviewbP PP Baby Mucus Extractor, Nasal Aspirator From Dr. Natural Healing. Patented Anti-backflow Valve, Doctor Designed and Patented. No Sucking, So No Filter to Buy or Use. PTwo one-directional valves to ensure mucus never flows back toward baby's nasal passagePRemoves the mucus causing baby's nasal blockagePRemoves mucus whether the bulb is being squeezed or releasedPNo need for filters or batteries. Nothing else to purchasePDisassembles easily after use for quick cleaning.