S-seals and T-seals in FFKM are replacing traditional O-rings in HPHT hangers and connectors. Larger cross-sections and built-in anti-extrusion flanges eliminate the need for separate backup rings. They achieve 30,000 psi rating with 0000 RGD performance and are qualified for 20-year subsea service without intervention. https://globalsealstech.com/oil-gas-seals/