This cast aluminum bubble-point test apparatus allows you to test the bubble point of 50mm 75mm and 90mm Nalgene® Rapid-Flow™ filter unit membranes without removing the membrane from the filter unit. Testing the bubble point helps assure product integrity. Can test all 50mm 75mm and 90mm diameter Nalgene® Rapid-Flow™ 0.20µm and 0.45µm disposable filter units and bottle top filters from 150 mL to 1 Liter. Accepts 1/4 inch (6mm) I.D. tubing. Adapters and O-rings included for use with 75mm and 90mm sizes. Pressure source and calibrated gauge not included. Material: cast aluminum. Sold individually. Nalgene® #: DS0405-0050.