Check the listing for details. Botanicare Ebb & Flow Bulkhead Screen Plastic Fittings Black 25-Pack. Color: Black, Condition: New. Listed at 28.00 USD. The Botanicare Ebb & Flow Bulkhead Screen Plastic Fittings Black 25-Pack is a set of 25 black plastic fittings designed for hydroponic systems. Specifically, these fittings include bulkhead screens to help with water aeration and circulation. Made by the trusted brand Botanicare, these fittings are essential components for maintaining a healthy and efficient hydroponic setup in your garden or outdoor space.