HEADWALLSView Photo Gallery 4″ & 6″ Lateral Outlet Pipe Headwall Double Headwall Detail Headwall / Pipe End Sec. & Outlet Structure w/ Redi-Rock Wingwalls Outlet Structure: Square Tapper Top – Pond Outlet Detail Redi Rock: Specification Triple Headwall Detail Related Products Box Culverts Bridge: 3 Sided Rigid Frame Bridge: Arch Culvert