The Sumner ST‑303 flange spreader (model 784001) is a compact, manual tool that separates flanges 1″–24″ on 150 lb to 1,500 lb systems. It features a hardened wedge and large feed screw for safe, controlled spreading. The drive accepts a 1 ⅜″ wrench or ½″ bar for easy operation. Built for heavy-duty jobs yet portable enough for tight spaces.