Moss Seal supplies elastomer elements and seals for blowout preventers, where sealing performance is a matter of well control rather than maintenance convenience. The packer in an annular preventer and the ram packers, top seals, and bonnet seals in a ram preventer must close reliably on pipe or open hole, hold rated pressure, and do it again after months on the stack. Behind them, the hydraulic operating system relies on piston and rod seals that must not leak or stick. We supply rubber-to-metal bonded packers, molded packing elements, O-rings, back-up rings, lip seals, and chevron packing in compounds matched to rated pressure, temperature, and well fluids.