You’ll see a few names depending on the use and bottle type:

• Dispenser pump: A general term for pumps used on bottles.
• Lotion/soap pump: Common for bathroom or kitchen liquids.
• Syrup pump: Sized for 750 ml glass syrup bottles or 1 L bottles.
• Gallon pump: Fits many 1-gallon jugs (often 38/400 necks).
• Replacement or universal pump: Designed to swap onto existing bottles.

When browsing, match the pump to your bottle’s neck/closure size (e.g., 28/400 or 38/400), check the dip tube length, and confirm it’s intended for your liquid type. Product pages usually list compatibility and output.

Most ship with a lock to prevent leaks during transport. A few things to try:

• Unlock the head: Hold the collar and twist the pump head (often counterclockwise) while gently pulling up.
• Remove travel clips or tabs: Some pumps include a small clip under the head that must be taken off.
• Loosen the cap: If the whole top was screwed down tightly, back it off slightly, then try unlocking again.
• Clear dried product: Rinse the nozzle and threads with warm water to free stuck parts.

After unlocking, prime by pressing several times until liquid flows. Designs vary, so packaging instructions can provide bottle‑specific steps.

Most bottle pumps are designed for still (non‑carbonated) liquids. With carbonated soda, two challenges often come up:

• Foaming and pressure: Carbonation can cause spurting and inconsistent flow when the pump agitates the liquid.
• Thread mismatch: Many pumps use common closures (e.g., 28/400 or 38/400) or are sized for 750 ml/1 L bottles, which may not match soda bottle threads.

Because of this, pumps may not perform as intended on soda. Checking the product description for compatibility and intended use is advisable. For most customers, using pumps with non‑carbonated syrups, soaps, or lotions tends to offer more reliable results.

A quick fit check can help you choose confidently:

• Match the closure size: Look for your bottle’s neck spec (e.g., 28/400 for many quart bottles, 38/400 for many gallon jugs, or pumps sized for 750 ml/1 L bottles).
• Confirm dip tube length: Many tubes are trimmable; you want it near the bottom without curling.
• Consider liquid thickness: Thicker lotions often need a pump designed for higher viscosity; thinner syrups/soaps can use lighter springs.
• Check output per stroke: Choose smaller or larger doses based on your use.
• Material preference: Stainless vs. plastic for look and durability.

Product pages typically list these details for easy comparison.

Output varies by pump type and model, but these ranges are common:

• Syrup pumps: Often around 1/4 oz (≈7 mL) per stroke.
• Gallon jug pumps: Frequently listed around 1 oz (≈30 mL) per stroke.
• Smaller soap/lotion pumps: Can vary widely; many fall below these amounts.

Actual output can change with liquid thickness and how fully the pump is primed. For a quick check, prime the pump and dispense into a measuring spoon or cup. Reviewing the product’s specifications on the page can help you pick a dose that suits your task.