GZ25N Reed Valve Bolt / GP420 / GP460 Muffler Cover Bolt $0.15 Quantity discounts available QuantityPrice Quantity: -+ SKU: AV834 ABOUT THIS PRODUCT:GZ25N Reed Valve Bolt / GP420 / GP460 Muffler Cover BoltAboutAboutReed valve bolt for GZ25N14 / GZ25N23 engine. Also connects muffler cover to cylinder on GP420 / GP460 engine. PMW part # 4521. Size M4 x 10.