How to Measure a Dip Tube (And the One Mistake That Trips People Up)

You've got your bottle. You've got your pump. You put them together, press down, and... nothing. Maybe a sad little sputter. Maybe just air. The product is sitting right there at the bottom of the bottle, and the pump has apparently decided it has other plans.

Nine times out of ten, that's a dip tube problem. And the fix is simpler than whatever you've been Googling for the last twenty minutes. (We also have more on dip tube sizing on the site if you want background before getting into the steps.)

What Is a Dip Tube?

The dip tube is the thin plastic tube that runs from the base of your pump down to the bottom of your bottle. When you press the pump, it draws product up through that tube and out through the nozzle. No tube, no draw. Wrong-length tube, same result.

If your pump is working but delivering nothing, and the bottle definitely has product in it, there's a very good chance the tube is too short to reach it, or it's kinked at the base because it was cut too long. Either scenario is fixable. Neither requires a new bottle.

When You Need to Measure a Dip Tube

Not every pump arrives perfectly sized for your bottle. Sometimes you're ordering replacement pumps that weren't made for your specific container. Sometimes you've switched bottle suppliers and the new dimensions are slightly different. Sometimes the pump ships with a longer-than-needed tube, and the assumption is that you'll trim it to fit.

In any of these cases, you need to measure. Here's how.

What You'll Need

A measuring tape or a ruler (the smaller the better to ensure you can measure inside the closure neck). You'll also need something to write with, because people are remarkably confident about remembered measurements right up until the moment they're not.

A clean pair of scissors finishes the job once you have your number.

Step 1: Measure the Bottle

Start with the bottle, not the tube. Measure the distance from the top of the bottle down to the base. Get the number, and write it down immediately. That number is your target.

Step 2: Measure the Dip Tube (From the Right Place)

Here's where most people go wrong, and it's a completely reasonable mistake. The natural instinct is to measure from the bottom of the closure, since that's the visible edge. But your actual starting point is the top of the gasket, which sits inside the closure.

The gasket is the small rubber ring inside your pump closure that creates a seal when the pump threads onto the bottle. Once the pump is seated, the dip tube functionally starts at the top of that gasket. If you measure from the bottom edge of the closure instead, you'll end up with a tube that's a little too long, which crimps at the base and produces a pump that almost works (somehow more frustrating than one that clearly doesn't).

From the top of the gasket, mark your dip tube at the length you recorded in Step 1. Then move to Step 3.

Step 3: Cut the Tube

If cutting straight across, cut just a little higher than your measurement. You can also angle your cut slightly if you're worried about it pressing flush against the bottom. If you measured correctly and left a small gap between the tube end and the bottle base, the tube won't press flush against the bottom, and nothing will block the draw.

If your bottle has a rounded interior base rather than a flat one, cut slightly shorter than the measurement to account for the curve. When in doubt, cut erring on the side of length, then test it. You can always trim more. You cannot add plastic back.

Your Dip Tube Checklist

Before you cut anything, run through this:

• [ ] Measured bottle from top to base.
• [ ] Located the gasket inside the closure (the rubber ring, not the bottom rim)
• [ ] Measured dip tube from top of gasket, not bottom of closure
• [ ] Marked the tube at the correct length

One step done wrong means starting over. Fortunately, dip tubes are not expensive.

When Standard Sizes Don't Fit

Off-the-shelf dip tubes come in a handful of common lengths, and most of the time you can trim one down to fit. But sometimes, with unusual bottle heights, specialty closures, or non-standard configurations, the closest standard length still isn't quite right.

Custom sizing is an option. At Container & Packaging, we cut dip tubes to the exact length your setup requires. If you're still sourcing the pump itself, our dispensing pumps page is a reasonable place to start before you commit to a configuration. You don't have to work through a bag of close-enough and hope one of them is close enough.

One Phone Call vs. Three YouTube Videos

Yes, this is our blog. Yes, we're going to suggest you reach out. But genuinely: this is the kind of problem that gets solved faster with one real conversation than without it.

If your pump still isn't drawing after measuring twice and cutting once, give us a call. A real person will pick up, ask about your bottle, your closure, and your product, and figure out what's actually going on. Sometimes it's a tube issue. Sometimes it's something else. Either way, you'll know what it is before the YouTube rabbit hole gets to video four.