PTFE Wiper Ring 38 mm with Green Scraper for SITA UV Sleeve Cleaning, article 3887-07-19. Data: for sleeve diameter 38 mm. 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. 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).