A blowout preventer assembly comprising: a containment structure, wherein the containment structure comprises: a unitary lower housing with a plurality of internal fluidly interconnected cylinders; a plurality of annular pistons and glands engaging the plurality of fluidly interconnected cylinders in the lower housing; a one piece energizing ring having a bowl in one end portion, wherein the energizing ring is operationally disposed circumferentially about a portion of the lower housing and in engagement with the plurality of annular pistons; and an upper housing including an inner ceiling with a spherical, concave shaped main bore for accommodating a main seal positioned over the bowl portion, wherein the lower housing and upper housing operationally enclose the one piece energizing ring, annular pistons, glands and seal; characterized in that the lower housing has a plurality of lower housing bifurcated retainer lugs disposed circumferentially about an attachment end of the lower housing, in that the upper housing has an integral structure with a plurality of upper housing bifurcated retainer lugs for interlace quarter tum engagement with the lower housing plurality of bifurcated retainer lugs, and in that the blowout preventer assembly further comprises a plurality of bottom plates for sealing the lower housing from an outside environment. a containment structure, wherein the containment structure comprises: a unitary lower housing with a plurality of internal fluidly interconnected cylinders; a plurality of annular pistons and glands engaging the plurality of fluidly interconnected cylinders in the lower housing; a one piece energizing ring having a bowl in one end portion, wherein the energizing ring is operationally disposed circumferentially about a portion of the lower housing and in engagement with the plurality of annular pistons; and an upper housing including an inner ceiling with a spherical, concave shaped main bore for accommodating a main seal positioned over the bowl portion, wherein the lower housing and upper housing operationally enclose the one piece energizing ring, annular pistons, glands and seal; characterized in that a unitary lower housing with a plurality of internal fluidly interconnected cylinders; a plurality of annular pistons and glands engaging the plurality of fluidly interconnected cylinders in the lower housing; a one piece energizing ring having a bowl in one end portion, wherein the energizing ring is operationally disposed circumferentially about a portion of the lower housing and in engagement with the plurality of annular pistons; and an upper housing including an inner ceiling with a spherical, concave shaped main bore for accommodating a main seal positioned over the bowl portion, wherein the lower housing and upper housing operationally enclose the one piece energizing ring, annular pistons, glands and seal; characterized in that the lower housing has a plurality of lower housing bifurcated retainer lugs disposed circumferentially about an attachment end of the lower housing, in that the upper housing has an integral structure with a plurality of upper housing bifurcated retainer lugs for interlace quarter tum engagement with the lower housing plurality of bifurcated retainer lugs, and in that the blowout preventer assembly further comprises a plurality of bottom plates for sealing the lower housing from an outside environment.