Plumbing
Pipe Small Wall Valve Green
While not as sturdy as solid concrete, iron constructions have high structural integrity, requiring fewer support pillars.
Salvage drops
Brass× 12-25
Extra parts when salvaged with a wrench, ratchet or impact driver.
Drops when destroyed
Iron× 1-2
Short Iron Pipe× 1
Where to find (4 POIs)
ChemTech Distribution Center (tier 4), Water Treatment Plant (tier 4), Pawsnout Factory (tier 3), Clunky Oil.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.