ORK2015 is the maintenance kit for Castellini Cleanwarm/Cleanthree air/water syringe adapter. This maintenance kit will replace internal O-Rings for the Castellini^® Cleanwarm/Cleanthree conversion kit. With continued daily use of adapters, replacing O-Rings every 6 to 12 months ensures no leaks or issues with adapters. If you are unsure, please visit our SYRINGE ID for further assistance.