Choosing the right size copper tee fitting depends on the pipe sizes in your project. Start by measuring the diameter of the pipes you plan to connect. Copper tee fittings are labeled by the size of each opening, so match these to your pipes. For example, a "3/4-inch x 1/2-inch x 3/4-inch" tee connects two 3/4-inch pipes and one 1/2-inch pipe. If you're unsure, bring a sample pipe or take a photo to compare with product details. Double-check compatibility with your plumbing system to help ensure a proper fit.

Yes, copper tee fittings are commonly used for both hot and cold water lines in residential and commercial plumbing. They're designed to handle typical water pressure and temperature ranges found in most systems. However, always confirm that the fitting is rated for your specific application by checking the product details. If you're working with specialized systems or higher pressures, consult a plumbing professional to make sure the fittings meet your needs.

• Sweat (solder) connection: Clean the pipe ends and fitting, apply flux, and heat the joint with a torch before adding solder. This creates a strong, leak-resistant bond.
• Push-fit connection: Some copper tee fittings use push-to-connect technology, which lets you simply push the pipe into the fitting for a secure seal—no soldering required.

Always follow the manufacturer's instructions and use proper safety gear. If you're new to plumbing, consider watching a tutorial or asking for advice at your local store.

Look for product descriptions or packaging that specifically state "lead-free." Many copper tee fittings are labeled as such to meet plumbing codes for potable water. You can also check for certifications like NSF/ANSI 61, which indicates the fitting is safe for drinking water. If you're shopping online, review the product details or ask a store associate for clarification. Using lead-free fittings is important for health and compliance with regulations.

In most cases, copper tee fittings that have been soldered are not intended for reuse, as the removal process can deform or damage the fitting. Push-fit or mechanical fittings may be reusable if they're removed carefully and remain undamaged. Always inspect the fitting for wear or residue before considering reuse. For reliable results and to help prevent leaks, it's generally recommended to use new fittings for each installation.