Cheap 500ml GL45 closure factory-Reagent Bottle for Sale. Nalgene™ Top Works™ Polysulfone, Closure, GL45, 3 port GL45 closure system for Nalgene Rapid-Flow filter bottles with 45mm necks, along with Schott , Corning and Wheaton media bottles. Additionally, 235-530 can be used with 4087, 209-2000 and the Thermo Scientific™ Nunc™ Cell Factory™ System to create sterile, closed systems.