DAYUAN Pneumatic CV Boot Expander 20-115 mm — Air-Powered Installer/Remover, 1/4" BSP

This air-operated installation and removal tool is engineered for professional mechanics and dedicated DIYers who work with flexible rubber CV and steering boots. It uses an expanding-finger mechanism to open the boot evenly so it slips over the joint without tearing, designed for boots 20–115 mm in diameter. Built with a threaded body compatible with a 1/4" BSP connector, the tool requires no disassembly of the joint and operates up to a safe 110 psi when used with an appropriate air supply and regulator.

How does the pneumatic expander make CV boot installation faster and safer?

The tool expands the boot uniformly using air pressure rather than manual prying, minimizing stress points and the risk of ripping fragile rubber. Because it holds the boot open while you position it, you get precise control and faster fitting, reducing time spent on each job.

• Uniform finger expansion prevents localized stretching and tearing
• Hands-free hold while fitting the boot onto the shaft
• Works quickly across a 20–115 mm diameter range

Which boots and joints are compatible with this DAYUAN tool?

It is intended specifically for flexible rubber CV and steering boots — not hard plastic or PVC boots. The expander works with many universal and OE-style rubber boots within the stated diameter range but will not function if the boot’s small opening cannot be spread by the fingers.

• Compatible: flexible rubber CV and steering boots
• Not compatible: PVC or hard plastic boots
• Diameter coverage: 20–115 mm for universal and original equipment boots

What are the operating requirements and safety considerations?

Operate the tool from an air supply with regulator set to at most 110 psi; exceeding this pressure risks damage to the tool and boot. Lubricate the boot lip before expanding, connect the 1/4" BSP air adaptor, expand to fit, then release and disconnect the air line when finished.

• Maximum recommended pressure: 110 psi — use a regulator
• Threaded body accepts a 1/4" BSP connector or exchangeable air adaptor
• Always disconnect air supply after use and lubricate boot prior to fitting

How should I use it step-by-step for reliable results?

Lightly lubricate the boot, slip the boot over the expander fingers, then activate the air valve to open the boot evenly. Slide the opened boot into position on the drive-shaft or joint, release the valve so the boot closes, and disconnect the air line when the job is done.

• Apply lubricant to the boot lip for smooth sliding
• Place boot over expander fingers, then press the air valve
• Fit over joint, release air to set boot, then disconnect the tool

Who is this for? The DAYUAN Pneumatic CV Joint Boot Expander is aimed at automotive professionals, mobile mechanics, and serious DIY enthusiasts who install or replace CV and steering boots regularly. It’s best for users who work with flexible rubber boots and have access to an air compressor and regulator. If your jobs require fast, repeatable boot installations while reducing boot damage, this tool is a practical addition to your garage or workshop toolkit.