This No Splash cap prevents spilling of water when trying to place a heavy 5 gallon water bottle onto water cooler or water dispenser. The cap will work with any bottle (2 gallon, 3 gallon, 5 gallon) that has the associated neck and mouth size. The cap is reusable and should work with most water dispensers and water coolers (water coolers with plunge/spike in the middle will NOT work).