Oasis OH-4+ Humidifier Refill Kit - 20 Replacement Crystals

• The OH-4+ is recommended for Oasis humidifier customers with many instruments.
• The kit comes with 20 humidifier refills. Only purchase this kit if you have previously purchased the OH-4 kit with the syringe, measuring scoop and instructions.
• The OH-4+ kit only contains replacement humigel crystals

The OH-4+ is recommended for Oasis humidifier customers with many instruments. The kit comes with 20 humidifier refills. Only purchase this kit if you have previously purchased the OH-4 kit with the syringe, measuring scoop and instructions. The OH-4+ kit only contains replacement humigel crystals