Tube Assembly, 90 .250 Od Sst is a genuine Bunn OEM replacement part. Part number 21812.0006 is used for certain commercial beverage equipment made by BUNN. This part will help repair specific issues you are having with Bunnomatic model CWTF commercial machines. Replace this part if BUNN or a service technician has instructed you to do so. Over time Tubes may need to be replaced because of normal wear and tear or if damage has occurred to the existing part. When replacing BUNN part #21812.0006 it is suggested that no power or water is connected to the machine and you are working in clean and non hazardous environment. Please be sure Tube Assembly, 90 .250 Od Sst fits your specific needs.