Sea Hawk Flood and Drain Fitting Kits - 13MM 19MM Tub Outlet |Screen & Extension

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The smaller (inlet) fitting is used to pump nutrient into the tray (flooding)

While the larger (outlet) fitting with the extension sits higher in the tray. Once the nutrient level in the tray reaches the height of the outlet screen, the excess nutrient can drain back to a reservoir.

The extension can be adjusted for more height, and extra extensions can be added for a deeper tray.

Flood & Drain Fittings - Benchmark Bioponics / Benchmark Horticultural PTY LTD