11-3/4 Oversized O.D. Top Sub with 6-5/8 FH Box Top Connect

11-3/4 Oversized O.D. Top Sub with 6-5/8 FH Box Top Connection with O-Ring and Back-Up Ring for use with Special Bi-Directional HP Pack-Off Assembly, 10,000 PSI Rating. (A12823)f/ Logan Series 150 Overshot.