Fills and pours automatically, rapidly. One head for all capacities, all volumes. Short tipping angle, interchangeable volumetric bulbs give reproducible volumes. Bulb joint is 14/20, head and flask 29/42. Complete apparatus consists of head, flask, volumetric bulb, clip, two 19mm (3/4-in) springs, one 38mm (1-1/2-in) spring.