This Vetrolux Sightglass Sight Glass Circular Discs DIN7080-10 9-13/16" BY 1-3/16" is in unused condition and is guaranteed to be functional. Please note that photos in listing were transferred from our smaller store that we are closing down due to lack of traffic/visibility. The majority of these photos were located in the description and as a result cannot be transferred. Please see screenshot of the description page from the original listing. We will be happy to provide additional information as well as new photos so please feel free to contact us with any questions. vetrolux sightglass discs to din 8902 and to din 7080 the glass discs are sized for being mounted into standard circular sightglass fittings to din 28120 / 28121 or similar, circular sightglass fittings for pn 0 (lightweight version) and also for use in screwed sightglass fittings similar to din 11851. The glass discs with central bore hole ø 10. 5 mm have the same application as the above, but may be fitted with the centrally operated wipers of the series w / wd. the glass plates are sized to be mounted into the rectangular or d-ended sightglass fittings lsg (r,rr) / rsg ( r,rr) operating conditions: nominal pressure: rated to the din standards. Versions with central bore hole for wiper application on request. temperatures: maximum 150c for sodium silicate glass to din 8902 (discs) maximum 280c for borosilicate glass to din 7080 (discs) maximum 150c for sodium silicate glass to din 8903 (plates) maximum 243c for borosilicate glass to din 7081 (plates) no minimum temperature limit. the glass discs / plates are toughened by a thermal treatment, the surfaces polished, and the edges ground smooth. certificates: - to be supplied against extra charge to din en 10204 - individual pressure tests special versions / options: - rectangular glass plates - fused glass / metal discs to din 7079 - laminated glasses of different diameters and thicknesses - glass discs of different diameters and thicknesses, made from only one glass block - special dimensions - drilled holes complementary products: sightglasses to din 28120 or similar, din 28121, for pn 0 (lightweight version), similar to din 11851, rectangular and d-ended sightglasses, sightflow indicators and their accessories