| Comparison : | Item # 1031-1933-48-48, 3" Tube O.D. x 3" Tube O.D. Flange Steel SWP-Flange Flat Socket Block O-Ring Face - Pipe 500 PSI Item # 1031-1933-56-56, 3-1/2" Tube O.D. x 3-1/2" Tube O.D. Flange Steel SWP-Flange Flat Socket Block O-Ring Face - Pipe 500 PSI
 Item # 1031-1933-56-56-K, 3-1/2" Tube O.D. x 3-1/2" Tube O.D. Flange Steel SWP-Flange Flat Socket Block O-Ring Face - Pipe 500 PSI
 Item # 1031-1933-64-64, 4" Tube O.D. x 4" Tube O.D. Flange Steel SWP-Flange Flat Socket Block O-Ring Face - Pipe 500 PSI
 Item # 1031-1933-64-64-K, 4" Tube O.D. x 4" Tube O.D. Flange Steel SWP-Flange Flat Socket Block O-Ring Face - Pipe 500 PSI
 
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