... water cap is for locking 3&5 gallon water bottle,55mm neck size,made of 100% new PE material, healthy,sanitary, 5 ... gallon water cap is for locking 3&5 gallon water bottle,55mm ... size,made of 100% new PE(HDPE&LDPE) material, healthy,sanitary for water packing, -55mm neck size.-Weight:14.2g.-Thickness:1 ...