Copper Tubing for Plumbing & HVAC
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Copper tubing, also called copper pipe, is commonly used in plumbing, heating, cooling, and other systems. Lightweight copper is antimicrobial, durable, and more resistant to corrosion than other metals. Types K, L, M, and DWV (Drain, Waste, Vent) are designated by ASTM International standard sizes. Each type represents a series of sizes with different wall thicknesses. Copper tubing must be permanently marked in accordance with its governing specifications to show tube type, the name or trademark of the manufacturer, and the country of origin.
Standards
Low-Pressure Type M Copper Tubing for Plumbing
Type M copper tubing uses less copper, has the thinnest wall thickness, and is lighter and more economical than other copper tubing for easy installation. Low-pressure applications include HVAC, potable water service and distribution, fire protection, fuel/fuel oil, and vacuum. ASTM specifications are permanently marked or incised in red to distinguish between other copper tube types.
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Medium-Pressure Type L Copper Tubing for Plumbing
Type L copper tubing has thicker or denser walls to handle greater pressures than Type M tubing. Type L hard tubes are found indoors to supply potable water, carry hot water, and supply water to sprinkler systems. Type L flexible roll tubing is easier to use underground and outdoors, doesn’t need fittings, and eliminates concerns about water wearing tubing down due to high pressure. Medium-pressure applications include plumbing, potable water service and distribution, fire protection, fuel/fuel oil, natural gas, LP gas, HVAC, compressed air, and vacuum. ASTM specifications are permanently marked or incised in blue to distinguish between other copper tube types.
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High-Pressure Type K Copper Tubing for Plumbing
Type K copper tubing contains higher amounts of copper and thicker walls than Types L and M to withstand higher pressures. This durable tubing is commonly used in commercial buildings, city water mains, and industrial construction. High-pressure applications for Type K copper pipe include potable water service and distribution, fire protection, solar, fuel/fuel oil, natural gas, LP gas, compressed air, HVAC, and vacuum. ASTM specifications are permanently marked or incised in green to distinguish between other copper tube types.
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Corrosion-Resistant Coated Copper Tubing for Plumbing
Plastic-coated Type K copper tubing eliminates the need for on-site tape wrapping or sleeving in tubing used underground or in potentially aggressive environments. The plastic coating protects copper from corrosive reactions during plumbing installations and construction. Applications for plastic-coated Type K copper pipe include potable/non-potable water, natural gas, liquefied petroleum gas, and fuel oil. ASTM specifications are permanently marked or incised in green to distinguish between other copper tube types.
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