A 23mm camera head is slightly smaller and easier to thread through tight bends, while a 25mm head usually carries a brighter LED ring and a sturdier housing. Both sizes suit pipes from about 1.5 to 4 inches. Pick based on your smallest pipe diameter and how many elbows the run has.
What the 2mm difference actually changes
Two millimeters sounds trivial. In a pipe inspection camera it affects three things: clearance, light output, and lens protection. A smaller head has less room for LEDs, so 23mm heads often use fewer, tighter-spaced lights. A 25mm head has a bit more shell thickness around the lens, which can mean better resistance to scrapes from rough cast iron or clay pipe joints.
Neither size is universally “better.” The right choice depends on your pipe diameter, not on chasing the bigger number. Manufacturers like VEVOR, Anysun, and Sanyipace offer both sizes across their consumer and semi-pro lines, and RIDGID SeeSnake systems use their own head lineup sized for professional drain work. Always check the stated minimum pipe diameter for the specific head, not just the millimeter label, since housing shape varies between brands.
Pipe size fit in practice
A 23mm head generally clears 1.5 inch pipe more comfortably than a 25mm head. That matters for bathroom sink lines, small vent stacks, and older galvanized runs. Once you move into 2 inch and larger pipe, both sizes usually fit without issue.
The tighter the pipe, the more the head’s shape matters as much as its diameter. Rounded, bullet-style housings slide through offsets more easily than flat-fronted ones, regardless of whether the spec sheet says 23mm or 25mm. If you inspect a mix of pipe sizes, the smaller head gives more margin for error. If your work is mostly 3 inch and larger, the size difference rarely decides anything by itself.
Before buying, measure your smallest access point, not just the pipe itself. Cleanouts, traps, and toilet auger openings can be narrower than the pipe run they lead into. The pipe size checker on this site is a quick way to cross-reference head diameter against common pipe categories before you commit to a camera.
Image quality and lighting
Head diameter is not a direct proxy for image quality. Sensor resolution, lens coating, and LED brightness all vary by model, independent of whether the shell measures 23mm or 25mm. That said, a 25mm head typically has more physical room for additional LEDs, which can mean more even lighting across the pipe wall.
In practice, condensation and grease film on the lens affect visibility far more than a couple of millimeters of housing size. Both head sizes benefit from a clean lens and adjustable brightness. If low light performance matters to your work, compare the stated LED count and any brightness adjustment feature on the specific model, rather than assuming the larger head automatically wins. Some 23mm heads on newer cameras use brighter LED chips than older 25mm designs, so specifications still decide more than raw size.
Cable, reel, and pushrod compatibility
Camera heads are usually matched to a specific pushrod and reel system, not sold as universal swap parts. A 23mm head on one brand’s pushrod will not necessarily thread onto another brand’s cable, even if both are labeled 23mm. Connector threading, wire count, and spring housing shape differ by manufacturer.
Pushrod flex also interacts with head size. A stiffer pushrod pushes a small head through bends with less wobble, while a flexible pushrod paired with a larger head can catch on tight offsets. Minimum bend radius specifications, when published, tell you more about real-world maneuverability than head diameter alone. Cable lengths on consumer systems commonly run 100, 130, or 165 feet, and that length choice matters more for long lateral lines than the head size does.
If your camera includes a 512Hz sonde or a self leveling head, confirm that feature is available in the head diameter you actually need. Not every size variant in a product line carries the same feature set. The camera head reference on this site lists which head sizes typically pair with self leveling and sonde options, so you can check before buying rather than after.
Which one to choose
Choose 23mm if you regularly inspect 1.5 to 2 inch pipe, older fixtures, or tight cleanouts. Choose 25mm if your work is mostly 2 inch and larger, and you want a marginally tougher housing for rough pipe interiors. If you inspect a wide range of pipe sizes and only want one camera, the smaller 23mm head is the safer general-purpose pick, since it fits into more openings without excluding larger pipe.
- Mostly 1.5 to 2 inch pipe: lean toward 23mm for clearance
- Mostly 2 to 4 inch pipe: either size typically works
- Rough or older pipe interiors: consider the 25mm housing for extra shell durability
- Mixed pipe sizes in one job: 23mm gives more flexibility overall
Whichever size you choose, confirm it against the actual minimum pipe diameter stated by the manufacturer, not the millimeter label alone. Two cameras with the same head size can still have different real-world clearance because of housing shape and cable stiffness.
Frequently asked questions
How do I know which head size fits my pipe?
Measure your smallest access point, including cleanouts and traps, not just the main pipe run. Compare that measurement against the manufacturer’s stated minimum pipe diameter for the head, since housing shape affects real clearance more than the millimeter label alone.
Can a 25mm head damage smaller pipe?
A 25mm head is unlikely to damage pipe by itself, but it can get stuck if the pipe or a fitting is narrower than its clearance allows. Forcing a head through an undersized opening risks jamming the pushrod rather than damaging the pipe.
What is the difference between self leveling and standard heads at these sizes?
Self leveling heads use an internal counterweight so the image stays right side up as the camera rotates inside the pipe. Standard heads simply follow the camera’s orientation, which can display the pipe interior sideways or upside down. Both 23mm and 25mm heads are available with or without self leveling, depending on the specific model.
Does head size affect the 512Hz sonde signal?
Head diameter does not change how a 512Hz sonde transmits its locate signal. What matters is whether the specific head includes a built-in sonde at all, since not every size variant in a product line has one. Check the model’s feature list rather than assuming by size.