**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.**
The Buffer rings have an NBR o-ring on the outside and Urethane ring on the inside for pressure spike applications. High quality urethane insures that the seal will stay energized at all pressures while the anti-extrusion ring helps protect the rod seal from rapid changes.