![](https://ahpseals.com/wp-content/uploads/2016/09/external-sealing-trapezoidal-back-up-ring.jpg)
ST21
External Sealing Trapezoidal Back-up Ring
Positively activated design to resist external seal extrusion and seal damage in ultra-high pressure sealing applications.
External Sealing Trapezoidal Back-up Ring
Positively activated design to resist external seal extrusion and seal damage in ultra-high pressure sealing applications.