BLAUBRAND®, class AS, Boro 3.3, DIN EN ISO 385. DE-M marking. Calibrated to deliver (»TD«, »Ex«). Schellbach-stripe. Automatic zeroing Intermediate. stopcock 4 NS / 19 for recirculating residual liquid. Ring marks at major graduations. Marks and inscriptions in high contrast blue enamel. Available with needle valve stopcock with PTFE spindle (PTFE key in intermediate stopcock) or STJ glass stopcock (glass key in intermediate stopcock). Supplied without bottle and rubber bellow. BLAUBRAND®, class AS, Boro 3.3, DIN EN ISO 385. DE-M marking. Calibrated to deliver (»TD«, »Ex«). Schellbach-stripe. Automatic zeroing Intermediate. stopcock 4 NS / 19 for recirculating residual liquid. Ring marks at major graduations. Marks and inscriptions in high contrast blue enamel. Available with needle valve stopcock with PTFE spindle (PTFE key in intermediate stopcock) or STJ glass stopcock (glass key in intermediate stopcock). Supplied without bottle and rubber bellow.