BOP parts that we supply all come from original manufacturers, they are 100% interchangeable. BOP PART NAME: top sealing, front sealing, pipe ram, blind ram, slip ram, shear ram, spherical packer, bonnet, piston, shell. APPLY TO BELOW BOP: Brand: SHENKAI BOP. RONGSHENG BOP ETC OTHER FAMOUS BRAND BOP Type: Annular BOP, Single Ram BOP, Double Ram BOP, Shear Ram BOP