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To obtain perfect joins, clean the inside of the fitting and the outside of the copper pipe using coarse steel wool , apply flux paste, then insert the pipe into the fitting and apply heat from a portable propane torch until a ring of solder shows at the edges of the fitting. Let the solder cool (do not pour on water) to obtain a durable weld. Yorkshire fittings are now made with lead-free solder.
The fittings come in a great variety of shapes, including types to fit taps and galvanized iron pipes.