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Load Type
Fans / Motors
Receptacle Type
Duplex Receptacle
Tamper Resistant
Water Resistant
# of Gangs
1 Gang
# of Outlets
2 Outlets
Trim Plate Design
Decora / Paddle
Black Finish
Maximum Load
15 Amps
110V AC
120V AC
Ease of Installation
Intermediate (Installs < 60 minutes)
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New SmartlockPro Slim GFCI Receptacle Installs Easily in Any Wallbox
Leviton WT599-E 15 Amp, 125 Volt SmartlockPro Slim GFCI Receptacle, Black
Leviton WT599-E 15 Amp, 125 Volt SmartlockPro Slim GFCI Receptacle, Black
Leviton WT599-E 15 Amp, 125 Volt SmartlockPro Slim GFCI Receptacle, Black
Item# 86667BK
Price: Normally $20.95 
Hot Deal $6.99
Free shipping on orders over $175 - See Details


  • Weather and Tamper Resistant GFCI Receptacle
  • Automatically tests the GFCI every time the RESET button is pushed
  • Provides up to 25% or more space in the wallbox vs. other GFCIs
  • Patented lockout feature for added safety
  • Terminals allow for easy wiring options for back or side wiring
  • Compatible with all Decora devices and wallplates

Essential Info

Slim is in. The Leviton SmartlockPro Slim GFCI installs easily and with industry-leading quality, professional grade lockout action, and the slimmest profile on the market make SmartlockPro Slim GFCI the smartest choice in ground fault circuit interrupter protection. Faster and easier to install in any wallbox because the depth is reduced, the slim GFCI mounts flush to the wall with minimal protrusion for a sleek, finished look. Enhanced features include external back wiring for positive indication the wire is properly seated, exceptional resistance to wire pullout and the ability to withstand high torque. The SmartlockPro is Tamper-Resistant to meet 2008 NEC Requirements for new or renovated residential construction. By blocking reset of the GFCI if protection has been compromised, SmartlockPro Slim GFCI reduces the possibility of end-users incorrectly assuming that a reset GFCI outlet is providing ground fault protection when it actually is not. A line-load reversal diagnostic feature is provided which prevents the GFCI from being reset and stops power from being fed to the GFCI receptacle face or through to downstream devices. A green LED indicator on the GFCI's face also illuminates to alert the installer to the line-load wiring reversal.

The Leviton SmartlockPro Slim GFCI Receptacle is also available in White, sold separately.

Features and Benefits
  • Reduced depth of SmartlockPro® Slim GFCI makes it easier to install in any electrical box, even shallow ones
  • Terminals allow for easy wiring options - back and side wire capable
  • External back wire clamps provide visual indication of proper wire seating
  • Withstands high torque and resists wire pullout
  • Standard brass self-grounding clip
  • Automatically test the GFCI every time the RESET button is pushed in
  • GFCI will not reset if the GFCI circuit is not functioning properly
  • Trip threshold meets or exceeds UL requirements for tripping time
  • Improved immunity to high-frequency noise reduces nuisance tripping
  • Compatible with all Decora devices and wallplates (wallplates sold separately)
  • UL Fed Spec WC-596 rated
  • Advanced electronics design provides superior resistance to electrical surges and over-voltages

  • Manuals/Software

    What's Included

  • 1x - SmartlockPro Slim GFCI Receptacle, Black
  • 1x - User’s Manual

  • More Info


    Manufacturer Product NoWT599-E
    Receptacle StyleDecora
    Receptacle SizeSingle Gang
    Amperage15 Amp
    Voltage125 Volt
    PolesTwo Pole
    WireThree Wire
    Trip LevelClass A, 5mA plus or minus 1mA
    TerminationBack & Side
    Face MaterialPolypropylene
    Body MaterialPolycarbonate
    Strap MaterialStrap Material
    Standards and CertificationsUL/CSA
    FlammabilityRated V-2 per UL94
    Short Circuit Current Rating10KA
    Manufacturer WarrantyTwo Year Limited Warranty

    Important notes:
    Only merchandise credit for defective items returned within 30 days of purchase. No other returns allowed on this item.



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