For installation at grade or with in-line piping up to 18" below grade. Trim lines allow field adjustment at 12" or 18". A complete dry chemical dosing system for flow rates up to 200,000 GPD (150 GPM). The IT 4000 is suitable for contact chamber, concrete pad or support bracket installation and includes three interchangeable outlet weir plates to control flow through the feeder. The IT 4000 has four (4) feed tubes and 6" inlet and outlet connections.