Connecting PEX (cross-linked polyethylene) to cast iron pipes requires the use of a transition fitting. PEX is a flexible and durable material used in modern plumbing systems, while cast iron pipes were commonly used in older construction. To join PEX to cast iron, you can follow these general steps:
Cut the cast iron pipe: Use a reciprocating saw or a snap cutter to cut the cast iron pipe where you want to make the connection. Be sure to make a clean, straight cut to ensure a proper fit.
Clean the cast iron pipe: Once the pipe is cut, clean the outside of the cast iron pipe thoroughly. Remove any debris, corrosion, or rust to ensure a good connection with the transition fitting.
Prepare the PEX pipe: Cut the PEX pipe to the desired length. It's essential to make a clean, straight cut on the PEX pipe for a reliable connection.
Choose a transition fitting: Look for a PEX-to-cast iron transition fitting specifically designed for this purpose. These fittings typically have a PEX end and a threaded or compression end that can be connected to the cast iron pipe.
Connect the fitting to the PEX pipe: Follow the manufacturer's instructions to attach the PEX end of the transition fitting to the PEX pipe. Depending on the type of fitting you have, this may involve using crimp rings, stainless steel clamps, or push-to-connect fittings.
Connect the fitting to the cast iron pipe: The threaded or compression end of the transition fitting should be connected to the cleaned end of the cast iron pipe. Use appropriate tools, such as a wrench or pliers, to tighten the fitting securely onto the cast iron pipe.
Test the connection: Before covering the connection or turning on the water supply, it's essential to check for any leaks. Turn on the water supply and inspect the joint for any signs of leakage. If you detect a leak, make sure to troubleshoot and address the issue promptly.
Note: While connecting PEX to cast iron is possible, you may want to consult a licensed plumber or a plumbing professional to ensure that your specific plumbing setup meets local building codes and regulations. Additionally, some areas may have specific guidelines for connecting different pipe materials, so it's essential to comply with those requirements for a safe and durable plumbing system.