The O-Rings will have been installed as a softer, more flexible barrier to prevent leakage. However, these properties will leave it somewhat vulnerable to being pinched or torn within the groove. One solution would be to use a Back-Up Rings to provide reinforcement with a stiffer material (They are generally fitted where the system pressure exceeds 1500 PSI). We offer Back-Up Rings in three main types, these being Spiral, Split and Solid. Back-Up Rings are commonly offered in either PTFE or Nitrile 90 shore materials, each providing their own unique protection to the O-Rings.