Plumbing
Pipe Small Wall 1x3 Green
While not as sturdy as solid concrete, iron constructions have high structural integrity, requiring fewer support pillars.
Drops when destroyed
Iron× 1-2
Short Iron Pipe× 1
Where to find (4 POIs)
Bob's Boars & Carl's Corn (tier 3), Hybrid Energy Substation #1 (tier 3), Ma Baker & Sons Bakery (tier 2), Clunky Oil.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.