Bottle Top Dispenser Fortuna POLYFIX 50ml With Amber Glass Cylinder w/PTFE Coated Piston POLYFIX® Dispenser comes with 2 adaptors made of Polypropylene GL 40 and 45. Light-Shy? POLYFIX® Dispenser with brown glass cylinders and glass piston The large number of light-sensitive liquids has led us to the decision to offer the POLYFIX® Dispenser with a brown glass cylinder coated with PP.