Copper pipe is a widely used material in plumbing and building services thanks to its strength, stability and predictable performance. Here are four main types of copper pipe.

Type L

Known for its versatility, Type L is widely used in internal water supply systems. It balances strength with flexibility and is available in both rigid and annealed forms. Type L’s performance also makes it useful for above-ground external applications where environmental exposure is expected.

Type K

Type K is the thickest-walled copper pipe, offering high strength and excellent pressure resistance. It is commonly used for underground water supply mains, specialist HVAC installations and situations where soil pressure or external forces demand additional robustness.

DWV

DWV copper pipe is designed for drain, waste and vent systems rather than pressurised water supplies. It is used mainly in older buildings or specialist refurbishments where copper is required for compatibility. Because it carries wastewater rather than mains pressure, it has a lower strength rating and is typically installed above ground. Modern fittings, such as these copper pipe examples, demonstrate how DWV can still integrate into broader system designs where needed.

Type M

Type M has thinner walls than the K and L grades, making it lighter and more economical. It is often used for interior branch lines where pressure demands are lower and codes permit its installation. Selecting the right pipe depends on pressure requirements, installation location and regulatory considerations. Matching the right grades to the appropriate task ensures plumbing systems are safe, efficient and long lasting.