Constructed with AISI 316 SS housings and GE-124 quartz windows bonded with FDA-approved quartz-based fill, High-Pressure Sight Glasses feature operating pressures up to 7,040 psi internal and 580 psi external, suitable for CO2- and butane-based systems. Chemically inert units are tested in accordance with Pressure Equipment Directive for vessels exceeding 10 L. Available in 1–2 in. sizes in ½ in. increments, glasses enable non-distorted viewing of process while operating from -60 to +220°C.