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Grommets are used to create watertight seals for the plumbing of hydroponic systems such as NFT systems, DWC systems, Dutch Bucket systems, water reservoirs etc.
A hole is drilled and the Grommet is inserted into the hole. Piping is then pushed through the grommet which will form a watertight seal.
The following grommet & piping combinations are advised:
9mm Autopot Piping (for use with Autopot Aquavalve 5): 9mm Top Hat Grommet