Use 3/8β³ grommets for AQUAvalve5 and 3/8β³ fittings.
Use 1/4β³ for older, pre-October 2020 AQUAvalves with 1/4β³ fittings.
Top Hat Grommets provide a water tight connection using 3/8β³ or 1/4β³ pipe with the 12.4 gal plastic reservoirs.
The Top Hat Grommet is positioned at the bottom of the reservoir. All AutoPot 12.4 gal plastic reservoirs are now supplied drilled and with 3/8β³ Top Hat Grommets.
If fitting a 3/8β³ grommet (for AQUAvalve5) to an existing/non-AutoPot plastic reservoir drill out to 1/2β diameter using a step drill.
If fitting a 1/4β³ grommet (for older, pre Aug 2020 AQUAvalves) to an existing/non-AutoPot plastic reservoir drill out to 7/16β diameter.
The grommet is then inserted into the hole and a length of 3/8β³ or 1/4β³ 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.








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