Identify the materials for piping each of the following bench services Gas, cold water, vacuum, steam? ?

Gas: Typically black steel or copper piping is used for gas lines.
Cold water: Copper, PVC, or PEX piping is commonly used for cold water lines.
Vacuum: PVC or stainless steel piping is often used for vacuum lines.
Steam: Carbon steel or stainless steel piping is commonly used for steam lines.

Gas

- Copper
- Stainless steel
- Black iron
- Polyethylene

Cold Water

- Copper
- Cross-linked polyethylene (PEX)
- Chlorinated polyvinyl chloride (CPVC)
- Polypropylene

Vacuum

- Polyvinyl chloride (PVC)
- Polyethylene
- Polyurethane

Steam

- Stainless steel
- Black iron
- Copper