What is the difference between two- and three-pronged plugs?

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Prices: Adapter Plugs
Sycamore Professional L14-30P Split Plug Adapter (4-prong) L14-30P Split Pl...

Converts an L5-30P 4-Prong Twistlock Outlet into (2) 120V Duplexes Lighted Duplexes for additional safety Heavy Duty 10 Gauge Wire 3 Feet in length Li...

$28.99
PowerEx International Travel Plug Adapter Kit

PowerEx's World Travel Plug Adapter Kit keeps you connected wherever you go. This international travel plug adapter kit is ground wire compatible and ...

$14.95
Sycamore Professional L5-30P Split Plug Adapter (3-prong) L5-30P Split Plug...

Converts an L14-30P 4-Prong Twistlock Outlet into (2) 120V Duplexes Lighted Duplexes for additional safety Heavy Duty 10 Gauge Wire 3 Feet in length L...

$28.99