A 6 mm inside diameter Module Tray Top Hat Grommet for Grommet-Fit 1Pot and 1Pot XL module trays. Outside diameter 12,5mm. Allows to use 6 mm pipe and AQUAvalve3 (6mm pipe and fittings) with Grommet-Fit 1Pot and 1Pot XL module trays. This grommet is not compatible with 9mm pipe or AQUAvalve5.