A sealing apparatus has a first cavity comprised of two separable sections for fastening about a second cavity, and the first cavity comprises a first flange that extends about the cavity's top periphery. The sealing apparatus further has a deformable seal located adjacent an inner surface of the first flange and a clamping seal flange fastened to the first flange adjacent and atop the deformable seal such that the deformable seal deforms as the clamping seal flange is tightened thereby creating pressure on side walls of the second cavity forming a seal.