Check the listing for details. Feliway Diffuser 30 Day REFILL ONLY, 48 ml. Condition: New. Listed at 24.99 USD. Feliway Electric Diffuser Refill Feliway Pheromome Diffuser enables reactions to stressful situations to be controlled and avoided. Reactions to Stress Are Expressed As: Urine marking, vertical scratching, loss of appetite, reduced desire to play, reduced desire to interact. Prevent Urinary Marking by the Cat Also Used to Comfort the Cat in an Unknown or stressful environment One vial lasts approximately four weeks Helps Calms the Cat to Move into a New House Helps Calms the Cat for Vet Visits