Copper pipes are commonly used for residential water supply lines and plumbing systems, known for their corrosion resistance, reliable connections, and a lifespan of up to 70 years. There are three common copper pipe types you might see in your home or when purchasing for DIY materials— Type K, Type L and Type M, and this guide will help you learn to tell the difference and determine which type is most suitable for your needs.

Type K Copper Pipe

Ideal for: Primary water lines and underground installations

Type K copper pipe boasts the thickest walls among the common varieties. This makes it suitable for water distribution, fire protection, oil, HVAC systems, and various other construction projects. Available in both hard (type k hard copper pipe) and flexible (type k flexible copper pipe) forms, Type K is particularly recommended for main water lines and underground installations due to its thick wall thickness, which enables it to endure the pressure from backfilled soil in trenches.

Typically marked with a green marking, Type K copper pipe is more expensive compared to other types and is therefore less commonly used for interior water supply systems.

Type L Copper Pipe

Ideal for: Interior branch water supply lines.

Type L copper pipe is commonly used for indoor hot and cold water plumbing, fire protection, and certain HVAC applications. Available in both hard and flexible forms, Type L is the most widely used type of copper piping due to its versatility, making it suitable for a broader range of applications compared to Type K. Additionally, Type L can be used in outdoor environments where it is directly exposed. It has a wall thickness which is thinner than Type K but thicker than Type M.

Typically marked with a blue marking, Type L hard copper is the preferred choice for professional plumbers when installing most indoor residential water supply lines.

Type M Copper Pipe

Ideal for: Branch plumbing lines.

Type M copper pipe has a thinner wall compared to both Type K and Type L pipes. It is commonly used for repairs, replacements, and extensions of interior water supply lines. However, it is essential to check with local building authorities, as Type M copper is not always compliant with hot and cold water plumbing codes. When allowed, it is often preferred for residential projects due to its relatively low cost—its thinner walls require less copper, making it more economical. DIY enthusiasts also favor Type M copper pipe because it is easy to cut and install, although it is not as flexible as Type L.

Type M copper pipe is typically marked with red marking.

Type K vs Type L vs Type M Copper Pipe: Which is Better

Pressure Ratings of Copper Tubing

Type K Copper Pipe

Known for its thick walls, Type K copper pipe is suitable for deep burial under streets and sidewalks. It is available in both hard and flexible forms and is identified by green markings to distinguish it from other types of copper tube.

Type L Copper Pipe

Primarily used for various pressure applications in residential and commercial hot and cold water plumbing systems, Type L copper pipe has a wall thickness that is thinner than Type K but thicker than Type M. It is available in both hard and flexible forms and is marked with blue marking to differentiate it from other types of copper tube.

Type M Copper Pipe

With the thinnest wall among the three types, Type M copper pipe is used for hot and cold water plumbing and pressure applications in residential and commercial environments. It is only available  in hard form and is identified by red markings to set it apart from it from other types of copper tube.

Copper Pipe Sizing Chart

Why choose from Jintian Group？

When choosing copper pipes for your hot and cold water plumbing, HVAC systems, or other construction requirements, the quality and reliability of the manufacturer are critical. Jintian Group stands out as a leading provider of copper pipes for several compelling reasons:

• High-Quality Standards

Jintian Group is renowned for its commitment to producing high-quality copper pipes. The company adheres to rigorous manufacturing standards and quality control processes, ensuring that every pipe meets or exceeds industry specifications. This guarantees exceptional durability, reliability, and long-term performance.

• Advanced Manufacturing Technology

Jintian Group utilizes state-of-the-art manufacturing technology and equipment. This enables precise production processes, resulting in copper pipes with consistent wall thickness, smooth surfaces, and superior mechanical properties. The advanced technology also supports the production of both hard and flexible forms of copper pipes,  catering to a wide range of application needs.

• Comprehensive Product Range

Jintian Group offers a comprehensive range of copper pipes, including Type K, Type L, and Type M, designed to meet diverse requirements such as water distribution, HVAC systems, fire protection, and more. This extensive product line ensures that you can find the ideal copper pipe for your specific project needs.

• Global Recognition and Certifications

Jintian Group has earned global recognition and numerous certifications for its copper pipes. These certifications demonstrate the company's strict compliance with  international quality and safety standards, giving customers confidence in the reliability and performance of its products.

• Excellent Customer Support

Jintian Group prides itself on offering exceptional customer support. The company offers comprehensive technical assistance, detailed product information, and reliable after-sales service to ensure customer satisfaction. Their knowledgeable and responsive support team is always available to address any inquiries or resolve issues promptly.

• Competitive Pricing

Despite offering high quality products, Jintian Group maintains competitive pricing. This ensures that their copper pipes deliver exceptional value for money, providing cost-effective solutions without compromising on quality.