Shop - Feliway Diffuser Pack w/48ml RefillFELIWAY Classic Diffuser is an excellent solution to comfort cats at home and avoid signs such as urine spraying, scratching or hiding. Nurtures your relationship with your cat, by creating a loving environment at home. Continuous effect, provides constant comfort for your cat. Clinically proven, veterinary used and recommended Easy to use Just plug and play: screw the bottle into the diffuser unit and plug it into an electrical socket, right side up.