ETL Listed • 15A / 125V • IP Waterproof

Don't Buy A New
Pressure Washer.
Replace The Plug.

If your GFCI plug trips, won't reset, or died in the rain — your pressure washer, pool pump, or power tool isn't broken. The plug is. Swap it in about 5 minutes with the Kaper 3-prong inline GFCI.

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✓ 6,000+ factory tests

✓ 25ms trip time

✓ Auto self-test every 5s

AUTO-MONITOR / 5s

15A · 125V

WATERPROOF / IP

TRIP < 25ms

// The Problem

Sound Familiar?

A bad GFCI plug kills thousands of pressure washers, pool pumps, and power tools every year. Here's how to tell if a $20 plug swap will bring yours back.

Plug Won't Reset

You press RESET and the light won't come on, or it trips again in seconds. Classic failed GFCI.

Dies In Wet Weather

Worked fine until it got wet. Moisture got into an old non-waterproof plug and it never came back.

Cracked or Burnt Casing

Visible damage, scorch marks, or the prongs wiggle. The motor is fine — the safety plug gave out first.

// Built-in Safety

Why Kaper Over Generic.

Cheap GFCIs pass UL minimums. Kaper doubles them. Here's what that actually means when you're standing in water holding a live electrical tool.

[ 01 ]

Self-Tests Every 5 Seconds

Most GFCIs self-test every 3 hours (the UL minimum). Kaper runs a full integrity check the moment you plug in — then every 5 seconds for as long as it's powered.

[ 02 ]

25ms Trip Speed

When a ground fault hits 4–6mA, Kaper cuts power in 25 milliseconds — roughly 10× faster than your heart can register the shock. That's the difference between a startle and a hospital.

[ 03 ]

Waterproof Build

Sealed rubber gasket and water-resistant housing rated for outdoor use. Standing water, rain, spray-back from the wand — the plug stays sealed, the circuit stays safe.

[ 04 ]

6,000+ Factory Tests

Every unit is tested against 2× the UL 943 standard before it leaves the line. Overkill on a GFCI is the right amount of kill.

[ 05 ]

Auto-Reset When Safe

Power blips and surges happen. When the fault clears, the plug restores power automatically — no crawling around behind the pool pump hunting for the button.

[ 06 ]

Tool-Free Install

Strip three wires. Screw them to the labeled terminals — BLK, WHT, GRN. Close the housing. That's the whole job.

// Technical

The Numbers.

15A

Current

1,800W @ 120V continuous

25ms

Trip Time

At 4-6mA ground fault

6kV

Surge

Lightning protection

3-Prong

Grounded

NEMA 5-15P · 14 AWG

// Compatibility

Fits Everything With A 3-Wire Cord.

If it's 120V, under 15A, and uses a 3-wire grounded power cord, this plug is the replacement.

Pressure Washers

Karcher, Sun Joe, AR, Simpson, Greenworks

Pool & Spa Pumps

Hot tubs, pool heaters, filter pumps

Power Tools

Saws, drills, grinders, air compressors

Lawn Equipment

Electric mowers, trimmers, leaf blowers

// Installation

≈ 5 minutes · No electrician required

Four Steps.
Done.

Kaper ships with the strain relief, back cover, three grommet sizes (18/16/14 AWG), and all screws pre-seated. Unplug the old one. Strip. Screw. Seal. Plug in.

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1

Strip the cord

Remove the dead plug. Strip the outer jacket back 21–22mm, then strip each inner conductor 8–9mm.
2

Match wire to screw

BLK → brass (hot) · WHT → silver (neutral) · GRN → green (ground). Tighten clockwise.
3

Clamp and seal

Slide the strain-relief clamp over the outer jacket and tighten. The rubber gasket makes it water-resistant.
4

Test before use

Plug in → light ON. Press TEST → light OFF. Press RESET → light ON. You're protected.

// Head to Head

Kaper vs. Generic GFCI.

Self-test interval

Every 5 seconds

Every 3 hours

Factory test cycles

6,000+ (2× UL)

UL minimum

Trip response time

25 ms

25–60 ms

Surge protection

6 kV

Often none

Auto-reset on recovery

✓ Yes

Manual only

Waterproof housing

✓ Sealed

Splash-resistant

Safety certification

ETL Listed · UL 943

Varies

// Questions

Before You Click Buy.

If your pressure washer uses a 120V, 15A or lower, 3-wire grounded cord (which covers almost all consumer-grade electric pressure washers — Karcher, Sun Joe, AR Blue Clean, Simpson, Greenworks, etc.), yes. Just count the wires inside the old plug: three wires (black, white, green) means this is your match.

No. The install is three screw terminals clearly labeled BLK, WHT, and GRN. If you can strip a wire and turn a screwdriver, you can finish this in about five minutes. Always unplug the cord from the wall before working on it.

This is the 3-prong grounded version, which means you need a 3-wire cord (two conductors plus a ground). If your tool has a 2-prong cord, look at Kaper's 2-prong GFCI listing instead — same safety standards, different prong count.

Auto-reset only restores power after a clean event — a momentary surge, a brownout, or a recovered fault. If a real ground fault persists, the plug stays tripped and locked out. Auto-reset is the right choice for pool pumps, vending equipment, and pressure washers where nobody is directly holding the tool when power is cut.

Plug it into a live outlet — the indicator light should come on. Press TEST — the light should go off and power should cut. Press RESET — light back on. Do this test monthly. If TEST doesn't trip it, stop using it and contact support.

Ships from Amazon's US warehouses with Prime-eligible delivery. Amazon's standard return policy applies — 30 days, free returns for defects or wrong fit.

Don't Buy A New Pressure Washer. Replace The Plug.