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6mm Top Hat Grommet | AutoPot Watering Systems Asia
Amazon.com: HORTIPOTS Tophat Rubber Grommet 3/4 Inch Fittings Hydroponic Grommets 19mm-20mm ID Holesaw 22mm Using with 3/4 in Rubber Tubing or Black Vinyl Tubing (Pack of 25) : Industrial & Scientific