Product review (5 stars): With this cord, you can easily comply with the new electrical code
With this 4-prong cord, you can easily equip your dryer or stove to bring it into compliance with the most recent national electrical code.  Unlike the 3-prong plugs for small electrical appliances (whose three prongs are for the "hot" wire, the neutral wire, and the ground wire, respectively), the 3-prong plugs for stoves and dryers have prongs for two "hot" wires, and a single prong for both neutral and ground connections.  The new 4-prong plugs provide a prong for each of the two "hot" wires, and separate prongs for ground and neutral connections.  This decreases the likelihood of accidents.

The conversion is simple.  You must first unplug your dryer (do not forget this step!), detach the connection cover, and remove the strain relief clamp.  Then you should see that the three wires from the electrical cord are attached to three terminals within the appliance.  You will need to detach all of these wires and remove the 3-prong cord.  To install the 4-prong electrical cord, you need to locate the white (neutral) wire within the appliance and detach it from the ground terminal to which it is connected (usually with a green screw).  This internal white wire and the white wire from the electrical cord must both be attached to the center terminal.  The green wire from the electrical cord must be attached to the ground terminal from which you removed the internal white wire.  The black wire from the electrical cord should be attached to the left terminal, and the red wire should be attached to the right terminal.  Then you should re-attach the strain relief clamp and the cover.

This conversion should reduce the chances of electrical shock or worse.  The installation process is simple, and you should be able to use this cord with virtually any dryer.  Cords are available in different lengths--what you prefer will depend on your situation.