5-3/4 O.D. High Pressure Pack-Off Assembly for 4 O.D., wit

5-3/4 O.D. High Pressure Pack-Off Assembly for 4 O.D., with Chevron Packing, with Special Top Sub Threads for use with Pn. A1035-HP-005 Top Sub with O-Ring.F/ Logan Series 150 Overshot.