3 & 5 Gallon Water Cap: You will receive 30 pieces of blue spill-proof water bottle caps, the inner cap design makes the spill-proof caps reusable and replaceable, refill your water jug for recycling and save money. Safety Material: Our spill-proof caps for water dispensers are made of high-quality plastic. The water bottle caps with a pull-off dust protection seal. Non-adhesive, mainly compatible with water coolers. Three-piece suit: Upgraded spill-proof plug system, no splashing, no leakage, seals stronger than universal caps, clean and safe to create a sterile environment for crystal clear water storage. Outer protective splash guard for dust protection. Excellent replacement: Water bottle snap cap suitable for 55mm 2, 3 or 5-gallon water bottles, for recycling and to save money. Perfect for snap-on bottles, not for use with screw-top bottles. Multiple occasions: The center button is fixed to the cap when placed, instead of floating around in the water; also for top-shelf water jugs or with a water pump both in the family and in the office. color: blue Material: plastic Package contents: 30 x water cap Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.