WaterGuard system helps reduce spills during bottle changes and reduces the chance for dirt and dust to enter the cooler reservoir. Just peel off the label and place the bottle on the probe that pushes in the inner cap.Specifications :For Use With Grainger Item Number: 29NT99, 29NU02, 29NU06, 29NU07, 46KL44Material: PlasticSize: 5 in LWARNING: California ResidentsThis product and/or packaging can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.