International customers: Extremely extended delivery times for USPS.  

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Buna Back-up Rings

**International customers: Please note that due to circumstances surrounding COVID-19, USPS International delivery times have become significantly longer.  Deliveries can take up to eight weeks.  Additionally, USPS International tracking information is not regularly updated.  For your convenience, UPS has been added as an alternate, more timely shipping option.  Rates will vary.**

 

Backup rings are designed to keep o-rings from rolling or extruding out from the groove. Backup rings are also used for U-Cups applications.