The R0993800 (previously the part number was 9-1416-01) UV Quartz Sleeve is for DEL Ozone's UV-C 50 Germicidal UV Unit for residential pools up to 50,000 gallons.  

R0993800 (9-1416-01) Quartz Sleeve details:

• Each UV-C 50 Unit has two 9-1421-01 UV Lamps (which has new part number of R09937001)
• Each of the R09937001 (9-1421-01) UV Lamps are housed in a R0993800 (9-1416-01) Quartz Sleeve/Tube
• "How often do I have to replace my Quartz Tubes?"  Occasionally the Quartz Sleeve/Tube breaks during handling, but they do not normally have to be replaced

RESOURCE CENTER | Download the following here:
DEL Ozone UV-C Installation and Operations Manual