BOTTLES, CLEAR, PRESSURE RESISTANT, MEDIA STORAGE, DURAN. With easy-to-read scale and large labelling field for easy marking, in fired-on, highly durable white ceramic. Pressure resistance conforms to DIN ISO 1595, confirmed by GS marking (TÜV ID: 0000020716). Vacuum and/or pressure resistant from –1 to 1.5 bar due to modified geometry (based on ISO 4796-1).