Vakuwash,Cuvette WasherTo wash, the opening of a standard cuvette is lightly pressed against the rubber pad, generating suction. The cuvette is sprayed with water or other cleansers added to the funnel, resulting in the cuvette being washed and cleaned. The spent fluid collects in the flask. As long as the cuvette maintains pressure against the cushion, the continued force sets up a stream of air flow into the cuvette and drys it thoroughly. Any residual water droplets may be removed with a final rinse with acetone. Funnel dimensions: 89mm (3 1/2“ ) diameter.Cuvettes are spray-washed under low pressure, dried by airflow and rinsed with acetone• Clean walls allow better light transmission• Includes 500 ml polypropylene vacuum flask and vinyl stopper with tubing Product photo may not exactly match the product offered for sale. Please refer to the product description.