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If you have purchased or are using your own large tank and do not have access to insert a 1/" water barrel tap you can use a 1/2" Top Hat Grommet. A 3/4" hole is drilled at the bottom of the tank and the 1/2" Top Hat Grommet is inserted into the hole. 1/2" pipe is then pushed into the grommet. This will form a water tight connection.