Heathrow Scientific HD20632C Pipette Filler, 54mm Length x 54mm Width x 130mm Height, Rubber, Blue This rubber safety pipette filler is designed for efficient one handed operation Control air evacuation, liquid uptake, and liquid dispensing with three valves, each containing a chemical-resistant stainless steel ball Pinch release valve for smooth liquid flow Filler fits standard size pipets Measures 54mm length by 54mm width by 130mm height