Types of Plumbing Pipes: Complete 2026 Comparison

Walk into the plumbing aisle and you will face a wall of black, white, red, blue and copper-colored pipe — and every one of them carries water or waste, but none of them are interchangeable. The main types of plumbing pipes used in American homes are ABS, PVC, PEX, copper, CPVC, cast iron and galvanized steel, and each one belongs to a specific job: drains, water supply, gas or venting. Pick the wrong material and you can fail an inspection, void a fixture warranty or end up ripping out work you just finished.

ABS Pipe

ABS (acrylonitrile butadiene styrene) is the rigid black plastic pipe you see under sinks and in unfinished basements. It is a drain, waste and vent (DWV) material — it carries wastewater away by gravity and is never used for pressurized supply lines.

ABS joins fast with one-step solvent cement (no primer), handles cold temperatures well and is lightweight and inexpensive. Its downsides: it degrades in prolonged sunlight, gets noisy in drain lines, and some jurisdictions restrict it. Typical lifespan is 50 to 80 years indoors. For the full story, see our complete ABS pipe guide.

PVC Pipe

PVC (polyvinyl chloride) is the white plastic pipe that dominates residential DWV work nationally. Like ABS it is a gravity-drain material, joined with a two-step primer-and-cement process that takes slightly longer but produces an extremely reliable weld.

PVC tolerates UV exposure better than ABS, runs quieter in some installations and is the default choice in most of the country. White Schedule 40 PVC is the workhorse; Schedule 80 (gray, thicker wall) appears in higher-pressure or commercial applications. PVC and ABS should not be solvent-welded to each other — mixing ABS and PVC requires a mechanical transition coupling. See how they stack up head to head in ABS vs PVC.

PEX Pipe

PEX (cross-linked polyethylene) is the flexible tubing — usually red for hot and blue for cold — that has taken over new residential water supply plumbing. It is a pressurized supply material, the modern replacement for copper in most new construction and repipes.

PEX installs dramatically faster than rigid pipe: it bends around corners (fewer fittings, fewer leak points), resists freeze-cracking better than copper or CPVC, and costs far less in both material and labor. Connections use crimp rings, cinch clamps or expansion fittings depending on the PEX type (A, B or C). Downsides: it cannot be used outdoors in sunlight (UV degrades it), some early fittings had dezincification issues, and a few municipalities were slow to approve it — though it is now accepted under all major model codes.

Copper Pipe

Copper is the traditional premium supply pipe — the reddish metal lines feeding fixtures in millions of homes built before 2000. Types K, L and M describe wall thickness (K thickest, M thinnest); Type L is the common residential choice, Type M is allowed in many areas for interior work.

Copper lasts 50+ years, handles heat and UV, is naturally antimicrobial and is fully recyclable. The catch is cost: copper pipe and especially copper fittings are several times the price of PEX, and installation requires soldering skill (sweating joints) plus fire precautions. Pinhole leaks from aggressive water chemistry are its classic failure mode. In 2026, copper survives mainly in high-end work, exposed installations and repairs to existing copper systems.

CPVC Pipe

CPVC (chlorinated polyvinyl chloride) is the cream/tan rigid plastic rated for hot and cold pressurized supply — essentially PVC's heat-tolerant cousin. It joins with solvent cement (one-step, with CPVC-specific cement) and was popular in the 1990s–2000s as a cheaper copper alternative.

CPVC handles water up to about 200°F, resists corrosion and is DIY-friendly. Weaknesses: it becomes brittle with age (especially with certain water chemistries), can crack if frozen, and has largely lost market share to PEX, which is more forgiving to install. You will still find it in many homes, and it remains code-legal — just handle old CPVC gently during repairs.

Cast Iron and Galvanized Steel

These are the legacy metals. Cast iron was the standard for drain, waste and vent stacks in older homes — heavy, quiet and extremely durable above ground, but it rusts from the inside out and is brutally heavy to work with. Galvanized steel (zinc-coated steel) was the old supply pipe; the zinc eventually wears away, the pipe rusts shut from inside, and water pressure and quality both suffer.

If your home still has galvanized supply lines, plan for replacement — restricted flow and rust-colored water are the telltale signs. Cast iron drains can soldier on for many decades but eventually scale and crack; replacement with PVC is the standard modern fix. Neither material is used in new residential work.

Side-by-Side Comparison Table

How to Choose the Right Pipe

Start with the system, not the material. Drain, waste and vent? Your choice is ABS or PVC (check local code — some areas favor one). Pressurized hot/cold supply? PEX for most jobs, copper for premium or exposed work, CPVC if you are extending an existing CPVC system.

Then check three things: code (your city or county may restrict specific materials — a quick call to the building department beats a failed inspection), compatibility (joining dissimilar materials needs the right transition — for example, connecting ABS to PVC takes a shielded coupling, not cement), and application limits (no DWV pipe on supply lines, no PEX in sunlight, no ABS where code prohibits it).

Budget matters too, but think in terms of installed cost, not just material price. PEX tubing is cheap, but the real savings are labor: a PEX repipe can take half the time of copper because long flexible runs replace dozens of soldered joints. Copper flips the equation — moderate material cost for the pipe itself, but fittings and skilled soldering labor push the total far higher. For drains, ABS and PVC cost nearly the same installed; pick whichever your local code and suppliers favor.

For repairs, match what is already there unless there is a good reason to change — a spot repair in PVC stays PVC. For remodels and repipes, weigh installed cost against lifespan: PEX usually wins on value for supply, PVC or ABS for drains. And when in doubt, the pipe guides library walks through each material in depth, including how to identify what is already in your walls.