| Type | Color | Use | Key Traits |
|---|---|---|---|
| PVC (Sch 40) | White | Cold water supply | Rigid, glued joints, long lengths, cheap |
| PVC-DWV | White | Drain/waste/vent | Thinner walls, not for pressure |
| CPVC | Tan/Light gray | Hot & cold supply | Chlorinated for heat resistance, glued |
| PEX | Red/Blue/White | Hot & cold supply | Flexible, crimp/clamp fittings, freeze-resistant |
| Polybutylene (PB) | Gray | Hot & cold (legacy) | Flexible, but discontinued—failure history |
| ABS | Black | Drain/waste/vent | Tough, rigid, solvent-weld, great for DWV |
| Polyethylene (PE) | Black | Cold water (irrigation) | Very flexible, low cost, not for hot |
PEX dominates new construction for supply. PVC/ABS standard for DWV. CPVC common in hot-water retrofits where copper was removed. Avoid polybutylene.
Scott Rodgers, plumbing author, supports pros from Crum Lynne to Eglin AFB.
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