The OptiMATE Lower Fluidics Conical includes a cap with a dip tube and vent tubing with a filter. This cap is specifically designed to connect OptiMATE gradients CsCl and Iodixanol bottles, as well as 250 mL conical sample containers to the upper fluidics path. Contains 4 Units. Endotoxin: ≤ 10 EU/device. Refer to OptiMATE Gradient Maker IFU for proper usage of the consumables.