Multi-Purpose Growing Tray Fitting Kit includes one fill/drain fitting (custom 1 inch bulkhead fitting with 1/2 inch screen, nut and O-ring) and one overflow fitting (1 inch bulkhead fitting with a 1 inch slip screen to keep out debris and a 3/4 inch adapter). Fits the AmHydro propagation tray. Can also be used for fodder, microgreens and baby greens.