The Globe Scientific 3375 Series of Manual Piet Controllers are available in your choice of five colors. They provide easy, accurate filling and dispensing of serological pipets between 0. 1 to 100mL. Squeeze the bulb to fill your pipet, then aspirate by moving the analog lever - slightly for slow, more for fast. Blow out is accomplished by pressing the button just below the bulb. Your 3375 is protected by an easily replaced internal 3um hydrophobic filter.