Most spills occur tipping a normal can to get the spout into the tank opening before the liquid comes out, or removing the spout from the target vessel before overflowing. The No-Spill spout is fully user controlled so you tip the can vertical, insert the spout into the vessel opening, then press the button to begin and control pouring. To stop pouring simply release the button. Practically eliminates spills and overflows. Lets you easily see level of liquids for mixing and helps reduce overflows during re-fills. Quart & Liter markings molded into the can - Easy reference for mixing liquids. High-molecular-Weight-HDPE polyethylene can, Viton seals and Stainless steel internal spring for trouble free operation and long service life. 7/8-inch funnel easily fits even small openings where frequent spills occur. Dust cap included to keep spout free from dust and debris.