5 gallonwatercap is for locking 3&5 gallon water bottle,55mm neck size,made of 100% new PE(HDPE&LDPE) material, healthy,sanitary for water packing, -55mm neck size.-Weight:14.2g.-Thickness:1.10mm.-Height:40.10mm.-Perimeter:174.14mm.-Inner diameter:53.78mm.-Hardness:(15S,5TLER)41-100% new PE material(food grade).-Non-toxic material,sanitary-The scoring is easy to tear.-Dust-proof-CQCS