2PK - TRRWC01 Reusable No-Splash Cap for 48mm Screw Top / Snap on Crown Top (needs to remove inside white ring) 3 & 5 Gallon bottles (water dispensers WITHOUT probes N Porcelain ceramic water dispenser). Silicon, polypropylene, BPA free. Does not fit onto glass bottles. Dishwasher safe. In order to keep the cap sanitary, it is important to clean it regularly. US Patent Pending.