4 prong to 3 prong dryer adapter: NEMA 10-30P 3-prong plug 125V/250V molded male. NEMA 14-30R 4-prong socket 250V molded female connector. 30 AMP, Max wattage 7500 watts, 1FT
3 prong to 4 prong dryer adapter: Green ground wire can plug into the nearest regular wall outlet or extension cord. The full four poles have connected and get power safety.
dryer plug adapter 3 to 4 prong outlet: Plug the 3 prong plug into the wall outlet and plug your dryer cord into its 4 prong outlet. Easy to use and worked flawlessly.
10-30P to 14-30R with external ground wire dryer plug adapter. It works when you move into an older apartment or house that has the 3 prong outlet while your dryer is with 4 prong plug.
dryer plug adapter: Best solution for moving from an older House into a newer one or newer House from older one!