Plus is the most advanced bottle top dispenser designed following years of research this next generation dispenser is highly robust and reliable. Plus has a recirculation value for redirecting the liquid into the bottle for bubble free dispensing without any loss of reagent. This Bottle Top Dispenser is made of Borosilicate Glass and has a smooth and soft plunger for easy working in difficult laboratory conditions. Solvent Resistant Borosilicate Glass Ball, Seal, and PTFE/ETP Piston.•Adjustment Knob (PP) 180º Rotation•Fully Autoclavable•Light weight and easy to use •Accuracy and Reproducibility According to ISO 8655Foxx Life Sciences is proud to represent high-quality Abdos plasticware and plastic laboratory products. For downloadable Certificates please visit: http://www.abdoslifesciences.com/Global/certificates.html.