Comprises a bulb and three pinch valves controlling influx and efflux of pipette contents. Efficient one-handed operation-through three valves to control the air discharge, liquid absorption and liquid distribution. The design can help you save time and effort when using it.Features- Material: Rubber.- Size: 13.00X6.00X6.00cm/5.11X2.36X2.36 inch.- Large suction force, not easy to crack, and the liquid is not easy to precipitate.- This rubber suction bulb is efficient for one-handed operation. It can meet your needs perfectly well, such as controlling air evacuation, uptake and dispensing liquids, etc.- Our 3 valves rubber pipette filler is made of natural rubber, safe and durable to use.- It is suitable for mining, agricultural research, food, chemistry laboratory, teaching, and so on.- It is manufactured with professional technology to ensure the of the product and can work for a long time.