ARP Billet Aluminum Piston Ring Compressor

The ARP Billet Aluminum Piston Ring Compressor (also called a tapered ring compressor or piston installation tool) helps engine builders install pistons with the rings already fitted into the cylinder bore. It is made for professional shops and serious home builders. Each bore size in the line is made to match its own bore diameter.

Key Features:

• Billet construction: CNC-machined from 6061-T6 billet aluminum tube material.
• True-radius design: Each compressor is machined with a true radius for its specific bore diameter. This gives even ring compression and a smooth transition into the bore.
• O-ring relief: The bottom is relieved to make room for wire O-rings.
• Durable finish: Type 3 black anodizing is used for long life and wear resistance.
• Easy identification: The bore size is engraved on the tool in large numbers.
• Made in the USA by ARP.

ARP's true-radius design is widely used by professional engine builders. It helps protect the rings and piston during installation. Both SAE and metric bore sizes are available. Always match the compressor to your block's bore size.