1. Type K Copper Pipe – The Heavy-Duty Standard

Type K copper pipe features the thickest wall among all copper grades. It’s designed to handle high pressure and heavy-duty applications, 

making it ideal for both aboveground and underground plumbing systems.

Best for: Underground water mains, fire protection systems, HVAC lines, and commercial-grade plumbing

Key Benefits:

Maximum strength and pressure resistance

Available in hard (rigid) and soft (flexible coil) forms

Excellent for burial without additional protection

Color Code: Green

2. Type L Copper Pipe – The All-Purpose Choice

The most commonly used copper pipe in residential and commercial plumbing is Type L. With medium wall thickness, it strikes a perfect balance between strength and flexibility.

Best for: Indoor water supply lines, hot and cold water distribution, and heating systems

Key Benefits:

Long-lasting in pressurized systems

Suitable for both aboveground and some underground applications

Easier to work with than Type K

Color Code: Blue

Plumbers prefer Type L for its versatility.

3. Type M Copper Pipe – The Budget-Friendly Option

Type M copper pipe has thinner walls than Type L, making it lighter and more cost-effective. It’s best suited for low-pressure indoor plumbing where budget is a concern.

Best for: Residential water lines, hot and cold supply, and light commercial use

Key Benefits:

Cost-effective without sacrificing reliability in low-pressure systems

Lightweight and easy to cut or install

Not suitable for underground or high-pressure environments

Color Code: Red

We recommend Type M only where local codes allow.

4. DWV Copper Pipe – For Drainage & Venting

DWV (Drain-Waste-Vent) copper piping is not intended for pressurized use. Instead, it’s designed to safely carry wastewater or vent sewer gases out of a building.

Best for: Wastewater systems, drain lines, and vent stacks

Key Benefits:

Lightest and thinnest among copper pipe types

Ideal for non-pressurized plumbing systems

Easy to install in older construction or remodels

Color Code: Yellow (or unmarked)

How to Choose the Right Type of Copper Pipe

Choosing the correct copper pipe depends on your plumbing application, pressure needs, and budget:

Pipe Type Wall Thickness Application Color Code

Type K Thickest Underground, high-pressure systems Green

Type L Medium Residential, indoor supply lines Blue

Type M Thin Indoor, low-pressure plumbing Red

DWV Very thin Drainage and venting only Yellow/None

Tip: Always check with your local plumbing codes before finalizing a pipe type. Need expert help?  technical team is here to guide you.

Conclusion

Copper pipes come in various types, each engineered for specific plumbing needs. Understanding their strengths and limitations helps you make informed decisions that lead to efficient, 

long-lasting plumbing systems.