P-seals serve as secondary seals in tubing heads and spools up to 20,000 psi. Integral or non-integral designs seal annuli effectively. Often used with lockdown screws or packoffs, P-seals resist extrusion and provide reliable isolation. Materials like HNBR ensure compatibility with well fluids. These seals support high-pressure transitions in wellhead assemblies https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/