Size depends on your bottle’s neck finish and the soap you’re using. Most replacement pumps list a neck size like 24/410 or 28/400 (the first number is the neck diameter in millimeters). You’ll also see options for wider openings, such as 33 mm threads for liter bottles, and styles that note compatibility with common 8–16 oz Boston round bottles.

• Check your bottle’s neck: Measure across the threads in millimeters or look for a size code.
• Match the thread style: Choose a pump with the same neck finish (e.g., 28/400).
• Pick the right type: Standard liquid vs. foaming pumps aren’t interchangeable.
• Tube length: Many pumps include a long dip tube you can trim for a better fit.

Walmart carries single- and multi-packs in various finishes to match your bottle and space.

A few simple checks can get many pumps working again. Results can vary based on usage and soap type, but these steps often help:

1. Flush and soak: Remove the pump head and soak it in warm water. Pump the mechanism in water to clear clogs. For mineral buildup, a brief soak in a mild vinegar solution may help.
2. Check the dip tube: Make sure it isn’t cracked, loose, or too long and bottoming out. Trim at a slight angle if needed.
3. Prime with water: Add a little warm water to the bottle and pump until flow returns.
4. Inspect seals: Ensure the cap is snug and any gasket is seated to prevent air leaks.

If the spring is corroded or parts are damaged, a replacement pump—often available in rust‑resistant materials—can be a practical fix.

Built-in and bottle-style dispensers can act up for a few common reasons:

• Clogs: Thick or dried soap can block the mechanism. Periodic warm-water flushes can help reduce buildup.
• Loss of prime: Air leaks from a loose cap, worn gasket, or cracked dip tube can interrupt flow.
• Leaks or drips: Worn seals or cross-threaded caps may cause seepage. Hand-tighten carefully and check O-rings if present.
• Bottle loosening: Under-sink bottles can loosen over time; reseat and tighten gently.
• Corrosion: In humid areas, metal springs may rust. Choosing rust‑resistant materials may reduce this.
• Wrong pump type: Foaming pumps need foaming soap (or correctly diluted formulas). Using the wrong type can cause inconsistent output.

Addressing the likely cause first can save time; if parts are worn, a compatible replacement from Walmart is often the simplest path.

The process is usually quick, and small adjustments can improve the fit:

1. Identify your setup: Countertop bottle or built-in sink dispenser. Note the bottle’s neck finish (e.g., 24/410, 28/400) and pump style (standard or foaming).
2. Remove the old pump: Unscrew the head. For built-ins, the pump often lifts out from above the sink.
3. Prep the new pump: Test the thread fit. Trim the dip tube at a slight angle if it touches the bottle bottom.
4. Install and hand-tighten: Avoid overtightening to protect threads and gaskets.
5. Prime gently: Fill with your soap, then pump until it dispenses smoothly.

Clearing space under the sink and keeping a towel nearby can make the swap tidier. Walmart offers a range of sizes and finishes, with pickup and delivery options for convenience.

They’re designed to handle soap differently, so choosing the right style matters:

• Foaming pumps: Mix air with specially formulated foaming soap (or properly diluted soap) to create foam. Using thick, undiluted liquid soap may clog these over time.
• Standard liquid pumps: Built for thicker soaps, lotions, and shampoos. They dispense a liquid stream rather than foam and may feel too "watery" with foaming formulas.
• Output and tube length: Some pumps are made for larger bottles (like liter-size) and may have higher output per stroke.
• Fit first: Always match the pump’s neck finish (e.g., 24/410, 28/400, or wider openings) to your bottle.

Walmart carries both types in multiple finishes and pack sizes, so you can pick what fits your bottle and your preferred soap.