Mild Steel S400 4" / 3.5" Weld On Down Tube V Band Flange Kit.

Includes: 

Mild Steel Weld-On Flange. (We use all mild steel for flanges due to the fact they do not warp like stainless steel while welded)

This flange fits 4" Pipe on the O.D. And 3.5" Pipe On The I.D.