Diversified Biotech Disposable Reagent Reservoirs, White Polystyrene, Choose Standard or Bio-Pure™ Biodegradable Reservoirs. Sterile or Non-Sterile. Choose 25ml, 25ml with divider, 50ml, 100ml, or 100ml with sidecar reservoirs. Units with divider or sidecar is convenient for adding controls. Graduation marks on inside walls.