Spacer glass for Hanovia ultraviolet disinfection systems, 185 mm long × 32 mm × 28 mm. The spacer sets the axial position of the lamp within the quartz sleeve assembly, holding it where the chamber was designed for it so the irradiated volume matches the validated dose. It is glass and is therefore a breakage item — check it whenever a sleeve is withdrawn. Ordered on dimensions, so measure the part being replaced. Reference number 2237-0207.