Flexible joint assembly

A flexible joint, said flexible joint comprising:

• a ring surrounding a longitudinal axis and having an outer surface and first and second ends oppositely disposed, said first end of said ring attachable to an end of a center spool;
• a sleeve surrounding at least a portion of said outer surface of said ring and having an inner surface slidably engageable with a section of said portion of said outer surface of said ring, said portion of said outer surface including said second end of said ring;
• and
• a coupling configured to attach said sleeve to said ring;
• wherein
• said portion of said outer surface comprises:
• a partial spherical segment having a longitudinal midpoint,
• a first frustoconical segment positioned adjacent a first end of said partial spherical segment, an outer surface of said first frustoconical segment tapering away from said partial spherical segment at a first angle,
• a second frustoconical segment positioned adjacent a second end of said partial spherical segment, an outer surface of said second frustoconical segment tapering away from said partial spherical segment at a second angle, and
• a first groove and a second groove spaced axially apart along said longitudinal axis, said first groove positioned on a first side of said longitudinal midpoint of said partial spherical segment, said second groove positioned on a second side of said longitudinal midpoint of said partial spherical segment opposite said first side, said first groove receiving a first seal and said second groove receiving a second seal, each groove of said first and second grooves having an inner wall and an outer wall.