The 273 Series Heavy-Duty Step-Cut Piston Seal is an ideal upgrade from traditional cast iron piston rings. Manufactured in a variety of high modulus materials, the 273 is easy to install and eliminates the threat of extrusion with higher-thannormal clearance gaps, as well as resists shearing when crossing ports. A single 273 seal can even replace multiple cast iron rings, while eliminating nuisance leaks. The 273 maintains the same wear-resistant characteristics as cast iron. Manufactured in a variety of materials and sizes from 6 mm to 2100 mm in standard or custom diameters.