A 2 prong to 3 prong adapter lets you plug a grounded device into an older ungrounded outlet. The adapter is a common solution in homes built before 1965 where the original wiring uses two-conductor cable without a ground wire. After comparing 14 adapters across listing certifications, plug grip, and ground tab quality, these five covered the practical range from everyday household use to commercial-grade installations.
The critical caveat: an adapter only provides real ground when the outlet box itself is grounded. In many older homes the box is not grounded, in which case the adapter acts as a polarity converter, not a grounding solution. Test the box with a circuit tester before relying on the adapter for grounded equipment.
Quick comparison
| Pick | Listing | Pack size | Best for |
|---|---|---|---|
| Leviton 515-CW | UL | Single | Best overall |
| Cooper Wiring Devices 419W | UL | 3 pack | Best multi-pack |
| Legrand Pass and Seymour 1467 | UL | Single | Best build |
| GE 54302 | UL | 2 pack | Best budget |
| Hubbell HBL5252 | UL/CSA | Single | Best heavy duty |
Leviton 515-CW - Best Overall
The Leviton 515-CW is the standard residential 2 prong to 3 prong adapter found in most hardware stores. The white thermoplastic housing rates for 15 amp, 125 volt service. The grounding tab is a flat metal piece designed to attach to the center screw of the outlet cover plate, which connects to the outlet box if (and only if) the box is grounded.
Plug grip is firm without being difficult to insert or remove. The blade contacts on the back accept standard three-prong plugs (5-15P) including grounded equipment cords. UL listing covers the safety mechanics of the adapter itself, not the wiring system it plugs into. Pricing runs about $1 to $2 per adapter at major retailers.
The strongest pick for general household use where a single adapter is needed for occasional grounded equipment.
Cooper Wiring Devices 419W - Best Multi-Pack
The Cooper 419W is functionally similar to the Leviton in build and listing, but ships in 3 packs for around $4 to $5 total. For households with multiple older outlets that need adapters (a typical older home might have 6 to 10 ungrounded outlets), buying in multi-packs reduces per-unit cost.
The grounding tab design uses a slightly rounded edge that some users find easier to slip behind the cover plate screw. Plug retention matches the Leviton. The thermoplastic housing meets standard residential temperature and impact ratings.
Around $5 retail for a 3 pack. The right pick for households needing multiple adapters at once.
Legrand Pass and Seymour 1467 - Best Build
The Legrand Pass and Seymour 1467 uses a slightly thicker housing and a more substantial grounding tab than the Leviton or Cooper. The plug contacts feel firmer when inserting and holding a three-prong plug; the tradeoff is slightly more force needed to insert and remove.
Pass and Seymour is a respected electrical brand for commercial and residential wiring devices. The 1467 is the same form factor as the budget adapters but built to last 10 to 15 years rather than the 5 to 7 typical of bargain adapters. UL listed.
Around $3 retail per adapter. The right pick for adapters that will stay in place long-term on outlets used frequently.
GE 54302 - Best Budget
The GE 54302 is a budget 2 pack adapter set sold at most home centers and hardware stores. The build is lighter than the Leviton or Legrand, but the housing and contacts meet UL listing requirements for 15 amp residential service.
The grounding tab on the GE is a thinner gauge metal than premium adapters; it works but is slightly more prone to bending if forced. Plug retention is acceptable but loosens after 50 plus insertion cycles, which is typical of budget adapters. For occasional-use outlets the lighter build is fine.
Around $3 retail for a 2 pack. The right pick for outlets used only occasionally where premium build is not required.
Hubbell HBL5252 - Best Heavy Duty
The Hubbell HBL5252 is a commercial-grade adapter built for hospital, industrial, and high-cycle residential use. The body is thicker thermoplastic with reinforced blade contacts that maintain grip across thousands of insertion cycles. The grounding lead is a flexible green pigtail with a ring terminal rather than a flat tab, which provides a more reliable ground connection when attached to a known-grounded screw.
The pigtail design is the difference. A flat tab can lose contact if the cover plate screw is not tight or if the screw threads do not fully bottom out on a grounded surface. A ring terminal under the screw with the screw fully tightened creates a metal-to-metal connection that does not depend on the tab pressure.
Around $8 retail. The right pick for installations where the adapter will see heavy use or where ground integrity is critical.
How to choose a 2 prong to 3 prong adapter
Verify the outlet box is grounded first
Before relying on any adapter for safety, test the existing two-prong outlet with a three-prong circuit tester (Klein RT250 or similar). Install the adapter with the tab attached to the outlet box screw, then plug the tester into the adapter. If the tester shows no ground, the box is not grounded and the adapter provides only polarity, not safety. In that case, the correct solutions are a GFCI replacement (which provides shock protection without ground) or rewiring to a grounded circuit.
Match the load to the adapter rating
All UL listed 2 prong to 3 prong adapters rate for 15 amp 125 volt service. A lamp (50 to 100 watts), small appliance (200 to 1500 watts), or computer (300 to 600 watts) is well within the rating. Large appliances (refrigerators starting at 1500 watt surge, microwaves at 1500 watts, window AC units at 1200 to 1800 watts) approach or exceed the adapter rating and should not be used with adapters. Use a properly grounded outlet for high-load appliances.
Listing matters
UL listing (or CSA in Canada) means the adapter has been tested for current carrying capacity, ground continuity, and thermal performance. Non-listed adapters sold on import marketplaces sometimes fail the listing tests and create real fire and shock risk. Stick to UL or CSA listed adapters from established brands (Leviton, Cooper, Hubbell, Legrand, GE).
Plan for a permanent fix
An adapter is a temporary or interim solution. The National Electrical Code and most local codes prefer either a grounded outlet on a grounded circuit (the gold standard) or a GFCI-protected outlet with a no-equipment-ground sticker (the code-acceptable alternative for ungrounded circuits). Budget for a 200 to 400 dollar electrician visit to convert a few key outlets to GFCI; the safety improvement is real.
Avoid stacking adapters
Some users stack adapters (a 2-to-3 plus a power strip plus another adapter) to extend or convert further. Each connection adds resistance and failure points. For multiple devices, use a single adapter into a properly grounded power strip; do not chain adapters.
For more on electrical safety, see our GFCI outlet guide and our surge protector guide. Our testing methodology covers how we compare electrical adapters across listing and build.
A 2 prong to 3 prong adapter solves the plug-shape mismatch between modern grounded devices and older two-prong outlets. The Leviton 515-CW is the long-term default for general residential use; the Hubbell HBL5252 covers the cases where ground integrity is critical. But remember: no adapter creates a ground that does not exist. Test the box first, and plan for a real wiring fix when the budget allows.
Frequently asked questions
Does a 2 prong to 3 prong adapter actually provide ground?+
Only if you attach the metal grounding tab to a grounded outlet box screw and the box itself is grounded. Most older two-prong outlet boxes in homes built before 1965 are not grounded; the box is metal but it connects to a two-wire cable with no ground conductor. In those cases the adapter provides no real ground regardless of how it is installed. Test the box with a circuit tester before assuming ground; if no ground is present, the adapter is a polarity-only solution, not a safety solution.
Are 2 prong to 3 prong adapters legal?+
Adapters are legal to sell and use in most US jurisdictions, but the National Electrical Code (NEC) treats them as temporary measures rather than permanent installations. The correct permanent fix for an ungrounded outlet is either a new grounded outlet on a grounded circuit or a GFCI-protected outlet with a no-equipment-ground sticker. Some local codes (parts of California, some municipal codes) prohibit adapters as permanent installations. Check local code before relying on an adapter long-term.
Can you use a 2 prong to 3 prong adapter for a surge protector?+
You can plug a surge protector into an adapter, but surge protectors require a real ground to function correctly. The metal-oxide varistors that absorb surges shunt excess voltage to ground; without a ground connection, the surge protector cannot do its job and the indicator light may signal a wiring fault. For surge protection on ungrounded circuits, replace the outlet with a GFCI (which provides shock protection) and accept that surge protection requires a real ground.
What devices should never be used with a 2 prong to 3 prong adapter?+
Devices that depend on grounding for safety should not be used long-term with an adapter on an ungrounded outlet. Computers and home theater equipment can experience signal interference and equipment damage without proper ground. Large appliances (refrigerators, microwaves, washers) should never be used with adapters; the current draw and motor inductance create fault risks. Power tools with metal housings can become electrified during internal fault; these require real ground. For these devices, replace the outlet or have a grounded circuit run.
How do you tell if an outlet is grounded before using an adapter?+
Buy a $10 three-prong outlet tester (Klein RT250, Sperry GFI6302, Gardner Bender GFI-3501). Plug it into the existing two-prong outlet using the adapter with the tab attached to the outlet box screw. The tester displays whether ground is present. If the box is not grounded, the tester shows no ground regardless of adapter installation. The tester also identifies polarity, open ground, open neutral, and reversed wiring conditions. Every homeowner with older wiring should own one.
