Top Hat Grommets provide a water tight connection using 9mm or 6mm pipe with the 30 & 47 L plastic reservoirs. The Top Hat Grommet is positioned at the bottom of the reservoir. All AutoPot 30 & 47 L plastic reservoirs are now supplied drilled and with 9mm Top Hat Grommets. The grommet is then inserted into the hole and a length of 9mm or 6mm pipe (according to the grommet used) is then pushed through the grommet. Push the pipe all the way through the grommet so that you can see the tube protruding inside the reservoir.
- Choose 9mm for AquaValve5 and 9mm Fittings - If fitting a 9mm grommet (for AQUAvalve5) to an existing/non-AutoPot plastic reservoir drill out to 12.5mm diameter.
- Choose 6mm for older, pre-August 2020 AquaValves with 6mm Fittings - If fitting a 6mm grommet (for older, pre Aug 2020 AQUAvalves) to an existing/non-AutoPot plastic reservoir drill out to 10mm diameter.
- Choose 16mm for 16mm pipe