DAYUAN Pneumatic CV Boot Expander Tool — 20–115mm Air-Driven Installer, 1/4" BSP, Professional

This professional-grade tool speeds up CV boot installation by using compressed air to expand a set of fingers, allowing a lubricated rubber boot to slip over a joint without tearing or excessive manual force. Built for workshops and experienced DIYers, the DAYUAN expander is designed to work only with pliable rubber boots (not rigid PVC) and connects via a 1/4" BSP thread to standard air systems. Follow pressure limits and lubrication instructions to ensure smooth operation and long tool life.

How does the DAYUAN air expander protect CV boots during installation?

The tool expands evenly to open the boot’s small mouth so the boot slides over the flange with minimal stress. That reduces pinching and stretching at the bead, lowering the risk of tears compared with manual prying.

• Even radial expansion avoids local overstretching.
• Works on boots with 20–115 mm diameters for broad compatibility.
• Use lubricant on the bead for smoother seating and less friction.

What air setup and safety steps are required to use this tool?

Connect the expander to an air supply using a 1/4" BSP fitting and keep pressure at or below 110 psi. If your compressor can exceed that, install a pressure regulator; disconnect the tool from air when idle.

• Threaded body accepts standard 1/4" BSP air connectors.
• Maximum recommended pressure: 110 psi; use a regulator if necessary.
• Disconnect air hose after each use to prevent accidental expansion.

Which boots are compatible and which should you avoid?

The DAYUAN expander is intended for flexible rubber CV and steering boots. It is not suitable for rigid plastics or very stiff boots that cannot be manually opened enough to slip over the expander fingers.

• Compatible: flexible rubber CV and steering boots.
• Not compatible: PVC or hard/plastic boots and extremely stiff materials.
• Check boot pliability by hand before attempting installation with the tool.

What is the step-by-step process for installing a boot with this tool?

Lubricate the boot bead, place the boot over the collapsed expander fingers, then actuate the air valve to expand. Slide the boot into position and release the valve to deflate the expander; remove the tool and fit clamps or bands.

• Apply suitable assembly lubricant to the boot bead.
• Position boot over expander, then expand with compressed air.
• Slide boot into place, release air, and remove tool before clamping.

Who this is for: The DAYUAN pneumatic CV joint boot expander suits professional mechanics, automotive repair shops, and skilled hobbyists who frequently replace CV or steering boots. It speeds repeat work, reduces installation damage, and is ideal where consistent, controlled expansion is preferred over manual stretching. Note: If a boot is too stiff to open even slightly by hand, choose a different installation method or a boot material suited to this tool.