Guarantee leakproof services with secure-fitting Thermo Scientific Nalgene Replacement Screw Closures and Gaskets for Nalgene Carboys. Material Polypropylene (PP) For Use With: Nalgene narrow-mouth and wider-mouth bottles Color: White No. per Case: 12 Description: Screw White Closure PP 100mm Item Description: 100mm Closure, PP, White, 12/Pk, 12/Cs Size: 100mm