NuTone 4-Pack Repellent Refill

For use with Haven Backyard Mosquito Repellent System only, HVRBRKTCB and HVRBRKTCX. Pack of 4 bottles with net content 24 ml. each. Each refill and fixture produces an invisible, odorless repellent that repels biting mosquitoes all season long.* Reaches optimal performance within 15 minutes of activation. Over 216 hours of mosquito protection per each repellent cartridges.