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) Fit Snap on most Crown Top (MUST remove inner ring) Fit ONLY 48mm Screw Top Bottle (not for 53mm) Fit ONLY water dispensers WITHOUT probes / Porcelain ceramic water dispenser (MUST attach included extention) Does NOT fit onto glass bottles Silicon, polypropylene, BPA free / Dishwasher safe In order to keep the cap sanitary, it is important to clean it regularly