Flow units are non adjustable capillary fittings designed for use with single line proportional flow systems such as 'Lubeshot', 'Lubeplus E' and 'LubeplusGX'. Flow units restrict the flow of pressurised oil at calibrated rates so that oil can be proportionately fed to bearings requiring different rates of lubrication. The flow rate is rated in drops per minute and doubles in flow rate between each unit with the flow value number stamped on the body. See the handy link below for a table equating flow values to volumatric rates.
Flow units are available as Junctions (prefix IM) for screwing into tapped holes or bearing tail pipes, as Tees (prefix IH) for connection through a junction header, Straights (Prefix IW & IB) for direct connection into bearings at the end of pressure lines.