Flange gasket for the Hanovia PMD200C/1/6 medium-pressure ultraviolet disinfection system, part 410003-0150. It seals the chamber flange joint on the pressure boundary and is a single-use item — a gasket that has been compressed once will not seal reliably a second time. The 0150 suffix in the part number distinguishes it from the 410003-0075 gasket used on the smaller SPA152 chamber. Reference number 22119-0815.