This tends to compromise the power and integrity with the joint. To circumvent porosity, eliminate the zinc coating while in the weld space. The best way to Faucet into Offer Lines To faucet into existing copper strains, shut from the drinking water. By using a tubing cutter Reduce a gap https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html