Flange gasket for the Hanovia SPA152/A/1/3/N medium-pressure ultraviolet disinfection system, part 410003-0075. It seals the chamber flange joint on the pressure boundary and is a single-use item, renewed on every flange break. The 0075 suffix distinguishes it from the 410003-0150 gasket used on the larger PMD200C chamber; the two share a part-number family but are not interchangeable. Reference number 22118-0815.