... 5 Gallon water bottle caps bottle cap,plastic bottle cap,5 gallon bottle cap· New food-rate plastic material. · Dustproof, Non- ... container. The degree of tightness between 5 Gallon cap and inner cap is coordinate mooderately,when normal using,the inner ... structure, surface and inside is smooth, without apparent shrinkage, bubble, flash and defectcolorcolor equablypollutionno dust, no plastic scrap or ...