ARP 900-0050 Billet Aluminum Piston Ring Compressor

The ARP 900-0050 is a precision-engineered piston ring compressor designed for professional engine builders and serious enthusiasts. CNC-machined from 6061-T6 billet aluminum tube material, this tool features a true radius bore that perfectly matches the cylinder diameter, providing superior performance compared to conventional tapered ring compressors.

Key Features:

• CNC-machined from 6061-T6 billet aluminum for exceptional durability and precision
• True radius design matches cylinder bore diameter exactly for easier piston installation
• Relieved bottom edge accommodates wire O-rings without interference
• Type 3 hard anodized finish for extended service life and corrosion resistance
• Bore size prominently engraved in large 3/4-inch numbers for quick identification
• Professional-grade tool widely used by engine builders and machine shops

This ring compressor eliminates the frustration of collapsed rings and damaged ring lands during piston installation. The true radius design provides uniform compression around the entire ring pack, allowing pistons to slide smoothly into the cylinder bore without binding or ring breakage. ARP offers standard sizes ranging from 3.552 to 4.750 inches for SAE applications and 75mm to 95.5mm for metric applications.