.020 Copper Cylinder Gasket for GP420 / GP460 Engine $5.95 Quantity discounts available QuantityPrice Quantity: -+ SKU: CA569 ABOUT THIS PRODUCT:.020 Copper Cylinder Gasket for GP420 / GP460 EngineAboutAboutReuseable copper cylinder gasket. Fits Chung Yang GP420 / GP460 engines. Copper gasket is .020" thick, just like stock gasket. This stronger gasket resists leaking and blowout.