Wash Bottles have an adjustable spray for every requirement. Set the nozzle on fine mist for TLC plates, position it to needle to rinse glassware, and pump a continuous, forceful jet on the big stream position for washing filters. No-effort pumping: The pump trigger is comfortable for one-handed operation, provides controlled delivery, and requires a very light pressure. Ease of use reduces finger fatigue when continuously pumping or rinsing a series of tubes. Contoured to fit in the hand, it makes the awkward-to-grasp, difficult-to-pump, and impossible-to-control squeeze bottle obsolete. The instant-off trigger release eliminates messy drips on the bench. Chemical-resistant and virtually unbreakable bottle is made of high-density polyethylene (HDPE). The sprayer is made of polypropylene (PP). Ideal for hot, cold, aqueous, and solvent-based solutions. The entire wash bottle may be gas or chemically sterilized, and it may be cleaned in the lab dishwasher. Zero contamination : Closed position on sprayer maintains solution purity by eliminating overnight evaporation and air/dust contamination. Squat shape takes up little bench space and assures a low center of gravity to eliminate tip-over problems. Double-headed design, available only in the 1000-milliliter size (1 liter), has a convenient side-fill opening to help maintain purity of solutions. When you do hit empty, the double-headed feature eliminates removing a dripping pump and allows refilling in seconds through a separate opening.