1) Manufactured from 3.3 expansion borosilicate glass complying with ISO 3585 (ASTM E-438 Type 1 Class A) 2) Comprises Drechsel type head with porosity 1 filter disc and GL14 PBT screwcaps with PP hose connections, GL45 PBT screwcap and DURAN 500ml laboratory bottle. 3) Bottle has easy-to-read graduated scale to estimate the bottle content. 4) Fired-on, highly durable white print 5) All component parts can be ordered separately