PVC Pipe: Schedules, Sizes, Uses, and How to Join It

PVC pipe is rigid white or gray plastic pipe used across most homes for drain, waste, and vent lines, cold water service, and irrigation. It is cheap, corrosion-proof, and easy to join with solvent cement. It is not rated for hot water. This guide covers schedules, sizes, uses, and how to glue a joint that holds.

What is PVC pipe?

PVC pipe is made from polyvinyl chloride, a rigid thermoplastic. It resists corrosion, does not rust, and shrugs off most household chemicals. Plumbers use it for drain-waste-vent runs, cold water supply, and irrigation. It cannot handle hot water, so code keeps it out of hot lines. A properly glued PVC system can last 50 to 100 years.

The material took over from cast iron and galvanized steel because it is light, inexpensive, and quick to assemble. A 10 foot stick costs a few dollars, and one person can cut and cement a run without a torch or threading machine. For a wider look at how it fits alongside other materials, see our overview of types of plumbing pipes.

Schedule 40 vs schedule 80 PVC: what changes?

Schedule sets wall thickness, not diameter. Schedule 40 and schedule 80 PVC share the same outside diameter for a given size, but schedule 80 walls run about 30 to 45 percent thicker. That extra wall means higher pressure ratings and a narrower bore. Schedule 40 (white) covers most homes. Schedule 80 (gray) handles industrial and high-pressure work.

The table below compares both PVC schedules against CPVC on wall, pressure, temperature, and use. Pressure figures are for 1 inch pipe at 73°F and drop as the pipe gets larger or hotter.

Schedule 40 and schedule 80 fittings thread and glue together because the outside diameters match, but a system is only as strong as its weakest part. Do not drop schedule 40 fittings into a high-pressure schedule 80 line.

What size PVC do you need?

PVC pipe is sized by nominal dimension, which is close to the inside bore, not the outside diameter. A 1 inch pipe actually measures 1.315 inches across the outside. Common home sizes run from 1/2 inch supply lines to 4 inch building drains. Match the size to the fixture and the drainage load your local code sets.

Every plumbing-grade stick prints its size, schedule, and rating along the side, so read the pipe before you cut. Drain and vent sizing is set by fixture units in your local plumbing code, which may follow the IPC or the UPC depending on your state.

Where PVC works, and where it fails

PVC pipe carries drain, waste, and vent lines, cold water service, irrigation, and pool plumbing. It is the workhorse of residential DWV. It is not rated above 140°F, so it cannot carry hot water, and most codes bar it from indoor hot supply. Never use it on gas, and check whether your area allows it for potable cold water.

Underground, white or green PVC is a standard sewer and drain material. See how it stacks up against cast iron, ABS, and clay in our guide to sewer pipe materials. Above ground and exposed to sun, PVC gets brittle over time, so paint it or sleeve it.

PVC vs CPVC vs ABS: which pipe for which job?

PVC and CPVC look similar but differ in heat tolerance. PVC tops out near 140°F; CPVC is chlorinated to handle hot water up to about 200°F, so it is the common choice for hot and cold supply. ABS is the black drain plastic joined in one step without primer. Copper and PEX are the metal and flexible alternatives.

Use PVC for cold DWV and irrigation, CPVC when you need hot water in plastic, and ABS where local code favors it for drains. For potable supply lines, many plumbers now reach for how to plumb with PEX or run copper pipe instead. PVC and CPVC use different cements, so never mix the two glues.

How do you glue PVC pipe?

PVC joints are solvent-welded, not glued in the everyday sense. Primer and cement chemically melt the two surfaces so they fuse into one piece. Skipping primer is the top cause of joint failure. Cut square, deburr, primer, cement, and seat with a quarter turn. Hold 30 seconds, wait about 24 hours before full pressure.

1. Cut the pipe square with a ratchet cutter or fine-tooth saw, then deburr the inside and outside edges so the joint seats fully.
2. Dry-fit the pipe and fitting to confirm alignment, and mark the depth and rotation with a pencil.
3. Brush PVC primer on the outside of the pipe end and inside the fitting socket, then let it flash off for about 10 seconds.
4. Apply an even coat of PVC cement to both primed surfaces while the primer is still wet.
5. Push the pipe fully into the fitting with a quarter turn to spread the cement, and line it up to your mark.
6. Hold the joint together for about 30 seconds so it does not push back out, then wipe the excess bead.
7. Let the joint set for 15 to 30 minutes before handling, and wait about 24 hours before full pressure. Cure time varies with size, temperature, and humidity.

Match the cement to the material and diameter: PVC cement for PVC, CPVC cement for CPVC, and heavy-body cement for pipe 6 inches and up. Work in ventilated space, because the solvents are strong.

What do PVC colors and markings mean?

Color is a quick field tell. White PVC is schedule 40 for pressure and DWV. Gray is schedule 80 for higher pressure. Cream, tan, or light gray usually means CPVC. Green often marks sewer pipe, and black is ABS. Always confirm with the printed markings, which list size, schedule, and NSF rating.

• White: Schedule 40 PVC, the standard for home DWV and cold water.
• Gray: Schedule 80 PVC for high-pressure and industrial lines.
• Cream or tan: CPVC, rated for hot and cold potable water.
• Green: often sewer and drain PVC (SDR 35), meant for buried lines.
• Black: ABS, a separate drain plastic, not PVC.

NSF-PW or NSF-61 on the print means the pipe is cleared for potable water. NSF-DWV means drain, waste, and vent only. Local code has the final say on what you can run and where, so verify before you buy.

Frequently asked questions

Is PVC pipe safe for drinking water?

PVC pipe stamped NSF/ANSI 61 is certified safe for potable water and has been tested to that standard since 1989. Finished pipe does not leach chlorine or vinyl chloride. Some areas still limit PVC on indoor cold supply and prefer CPVC or PEX, so check your local code before running it to fixtures.

Can PVC pipe be used for hot water?

No. Standard PVC is rated to about 140°F and softens above that, so it cannot carry hot water safely. Codes keep it out of hot supply lines for that reason. For hot and cold potable water, use CPVC, which handles roughly 200°F, or copper or PEX. PVC stays on cold water, drains, and vents.

What is the difference between PVC and CPVC?

CPVC is PVC that has been chlorinated, raising chlorine content from about 57 percent to 63 to 69 percent. That change lets CPVC handle water up to roughly 200°F, so it works for hot and cold supply, while PVC caps near 140°F. CPVC is off-white or tan, costs more, and uses its own cement.

How long does PVC pipe last?

Modern PVC pipe can last 50 to 100 years with little degradation, which is why it dominates residential drain and vent work. Buried lines are protected from UV and see stable temperatures, so they often reach the top of that range. Sunlight is the main enemy, so exposed PVC should be painted or sleeved.

Do you need primer with PVC cement?

Yes for code-compliant work. Primer cleans and softens the pipe and fitting so the cement bites deeper and fuses a stronger joint. Skipping it is the leading cause of leaks and blowouts, and inspectors look for the purple primer ring. Some one-step cements exist for low-pressure use, but primer plus cement is the reliable standard.

What is PVC pipe used for?

PVC pipe handles drain, waste, and vent lines, cold water service, irrigation, sprinklers, and pool and spa plumbing. In homes it is the standard for DWV because it is cheap, light, and corrosion-proof. Schedule 80 PVC handles higher-pressure and industrial jobs. It is not used for hot water, gas, or, in some areas, indoor potable supply.

Last reviewed: September 2026.