Descriptions of Ram BOP Variable Ram Assembly: 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 Working pressure:2000psi-15000psi(14 Mpa-105Mpa) Operating temperature:-18deg--121deg Bore size:7 1/16"-21 1/4" Top & nottom connection:Flanged,studded