Base Ring Insert Kit - EcoVacInsert ring for Dometic toilets. Installed below the bowl seal kit.Compatibility: Dometic 146/ 147/ 148/ 149 Ecovac and 3006/ 3008/ 3110/ 3310 Magnum Opus Model ToiletSpecifications: Color - White Dimensions - 5-3/16" OD x 5/8" Thick x 3.75" ID *Sold as an IndividualLegacy # 385311292 WARNING: This product can expose you to chemicals including ARSENIC which is known to the State of California to cause cancer or other reproductive harm. For more information go to P65Warnings.ca.gov.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.