The 4mm Top Hat Grommet provides a water tight connection using 4mm pipe with the 30 L & 47 L tanks. The 4mm Top Hat Grommet is positioned at the bottom of the tank, by firstly drilling a 10mm hole. The grommet is then inserted into the hole and a length of 4mm pipe is then pushed through the grommet. Push the tube through the grommet so that you can see the tube protruding inside the tank.
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