Adjust. Ring Compressor 4.125in- 4.205in Gold

The Adjustable Ring Compressor 4.125in–4.205in Gold by PROFORM is a precision engine assembly tool designed for serious engine builders and mechanics performing piston and ring installation work. This tool is essential for any complete engine rebuild or overhaul, allowing you to compress piston rings to a controlled diameter that safely passes through cylinder bores without damage.

Engineered with an adjustable band mechanism, this ring compressor allows you to set precise compression between 4.125 inches and 4.205 inches, accommodating a wide range of bore sizes and piston configurations. The gold anodized finish resists corrosion and enhances visibility during detailed engine work, while the aluminum band with steel components ensures durability during repeated assembly cycles.

This tool is ideal for engine builders, transmission shops, diesel mechanics, and DIY enthusiasts tackling short-block assembly or complete engine rebuilds. Its design protects delicate compression rings, oil control rings, and second rings from deformation or breakage during installation into the cylinder bore.