Clogged or jammed garbage disposals are some of the easiest repairs to make. You don't even need an extra tool because every new garbage disposal should come with a hex wrench attached to the disposal itself. Your garbage disposal should also come with instructions on how to properly repair the disposal if it gets jammed. Always make sure the power to the disposal is turned off at the source before you attempt any repairs. Make sure you know what types of foods are intended for garbage disposals, and run it as often as you can to prevent clogs or jams.
Cast iron and ductile iron pipe was long a lower-cost alternative to copper, before the advent of durable plastic materials but special non-conductive fittings must be used where transitions are to be made to other metallic pipes, except for terminal fittings, in order to avoid corrosion owing to electrochemical reactions between dissimilar metals (see galvanic cell).