BrandTech 4731140 Dispensette Organic 1-10ml Analog Adjustable Bottletop Dispenser, without SafetyPrime Valve Model: analog adjustable, without SafetyPrime valve; capacity: 1-10ml Floating piston system specially suited for organic solvents, concentrated acids and peroxides Handles your critical solvents: THF, TFA, methanol, acetonitrile, methylene chloride, DMF and DMSO Reinforced discharge tube with threaded safety cap; SafetyPrime valve to conserve solvents and reduce 'spurting' while priming Safety discharge system to reduce the chance of inadvertent dispensing, and telescoping filling tube and thread adapters to fit to most lab bottles