A built-in automatic soap dispenser drops through a pre-drilled sink or counter hole, locks down from underneath, and primes at the sensor in about a minute.
One wrong measurement turns a 15-minute job into a cabinet full of drips. Installing a built-in automatic soap dispenser for a kitchen sink comes down to three numbers: hole diameter, the gap to your faucet, and the clearance underneath. Get those right and the rest is tightening and priming.
The sequence below works whether you’re swapping a dead pump or cutting a fresh hole. You’ll need the dispenser kit, a tape measure, an adjustable wrench, and — if the hole isn’t there yet — a 1-inch hole saw or step bit.
What To Check Before You Buy Or Drill
Those three checks decide whether your sink is compatible at all — and if there’s no hole and you don’t want to cut one, a deck-mounted or freestanding sensor dispenser is the fallback.
- Hole diameter. Read the spec sheet for your model before drilling anything.
- Faucet clearance.
- Space underneath. Sloan also says to confirm the dispenser body clears everything above and below the countertop. The bottle, tubing, and control box all live in that cabinet.
- Power type. Chicago Faucets builds both DC battery units and AC transformer models, so decide whether you have a grounded outlet under the sink or want the battery version.
- Base sealing. Skip the putty unless your kit’s own instructions say otherwise.
Still comparing kits? Our tested roundup of the best automatic soap dispensers for a kitchen sink covers the models that fit standard deck holes.
| What To Measure | Target Spec | Why It Matters |
|---|---|---|
| Counter hole diameter | 1 inch (Sloan ESD-250) | The shank and washer slide through |
| Replacement hole range | 15/16 to 1-1/4 inches | Fits most existing dispenser holes |
| Metric hole size | About 32 mm | Common on imported sink decks |
| Body-to-faucet gap | At least 120 mm | Stops accidental sensor triggers |
| Under-deck clearance | Room for nut, bottle, tubing | Nothing blocks the mount or bottle |
| Bottle fill | 12 ounces of soap | Enough to prime without overfilling |
| Base seal | O-ring, no plumber’s putty | Seals without harming the finish |
| Power supply | DC battery or AC transformer | Decides your outlet and wiring needs |
How Do You Install The Dispenser Step By Step?
Installation runs seven steps: verify the hole, drop the body in from above, tighten the mounting nut underneath, connect the bottle and tubing, fill with soap, prime until soap flows, then test the sensor. Nothing here needs a licensed plumber.
- Verify the hole and clearance. Confirm the opening matches your model’s required diameter and that nothing above or below the deck will block the body, nut, or bottle.
- Insert the dispenser body. Slide the shank down through the hole from above the sink deck, with the soap outlet facing the basin.
- Secure it from underneath. Fit the washer, thread the mounting nut on, and tighten it snugly with a wrench or by hand as your kit directs. Don’t overtighten — the O-ring handles the seal.
- Attach the bottle and tubing. Hang the soap bottle below the deck and connect the hose to the pump or control box. On an AC unit, seat the transformer and plug it in now.
- Fill the bottle. Add about 12 ounces of liquid soap before the pump head goes on. Overfilling can push soap past the seal.
- Prime the system. Press and hold the dispense button until soap reaches the outlet, then let go. The G-Series dispenser instructions follow this same prime-and-hold sequence.
- Test the sensor. Peel any shipping tape off the sensor window, then wave a hand in front of it. A measured shot should land in the basin within a second or two and stop on its own.
Priming, Testing, And What Goes Wrong
Most post-install problems trace to three causes: an unprimed line, the wrong soap, or a sensor with tape or a soap smudge on it. Air, sediment, and foam-versus-liquid confusion cover nearly everything else.
Air is the usual culprit. A brand-new line is packed with it, so the first twenty or thirty presses may do nothing but push air through. Keep pressing — once soap reaches the pump, the shots turn consistent and the sensor settles into a rhythm.
Use the soap the unit was built for. Gritty, thick, or lotion-style soaps kill the pump.
If the sensor stops responding, check the basics first: tape still on the window, a dead battery, or a transformer that worked loose from its outlet. For AC models, keep the transformer and outlet dry and away from drips, following the manufacturer’s placement instructions.
Five things decide how this job goes: a hole between 15/16 and 1-1/4 inches, 120 mm of faucet clearance, open space under the deck, 12 ounces of fresh liquid soap, and a full prime before you judge the sensor. Nail those and the pump will outlast the faucet beside it.
FAQs
Can You Install A Dispenser Without Drilling?
Not a built-in one — those are made for a pre-drilled hole in the sink deck or countertop, and the body has to pass through it. If your sink has no hole and you’d rather not cut one, a deck-clamp pump or a freestanding sensor dispenser sits on the counter instead and needs no drilling at all.
Why Does A Foam Dispenser Push Liquid Soap?
Because it’s still priming. Once the line is full and the unit runs normally, the foam cartridge aerates the soap. If it keeps pushing liquid afterward, your bottle may not be filled with a foaming formula.
How Much Soap Goes In The Bottle?
Start with 12 ounces, which leaves room for the pump head and enough volume to prime the line. Overfilling can force soap past the base seal, so stop where the bottle’s fill line sits. Refill once the pump starts sputtering — running the line dry pulls in air and you’ll have to prime the whole system again.
References & Sources
- GWA / G-Series. “G-Series Hands Free Soap Dispenser Instructions.” Supports the installation and priming sequence.
- Sloan. “ESD-250 Soap Dispenser Installation Sheet.” Specifies the 1-inch counter hole and the 15/16 to 1-1/4 inch replacement range.
- Toto. “Automatic Soap Dispenser Instructions.” Documents the 120 mm clearance between the soap outlet and the faucet.
