O-Ring 23 x 4 mm for SITA Quartz Sleeve 40-80 Series, SI028061, article 3803-0508. Data: inside diameter 23 mm, cross-section 4 mm. OEM reference: SI028061 / 028061. Fits: SITA 550 Plus LCD Rack, SITA 800 Plus LCD, SITA UV PE 22, SITA SRL 80/8, SITA Pallas 705 S. Seals quartz sleeve SI028105 in gland SI028060. Sleeve and chamber seals harden under UV, heat and chlorinated water. Replace them at every lamp or sleeve service; a re-used O-ring is the usual cause of a leaking sleeve gland. SITA LCD / Rack LCD series data: low-pressure 40-80 W lamps, 9,000-10,000 h lamp life, 1-40 m3/h, chamber in AISI 304 or 316L. Spare part for UV disinfection systems of S.I.T.A. srl, Genoa, Italy, which builds low-pressure, amalgam and medium-pressure UV units for drinking water, food and beverage, aquaculture, swimming pool, marine and wastewater duty (series AL, LCD / Rack LCD, AM, IT, 440, HDPE, SBT, SMP, SSD, TOC, GR and Pool).