Sierra International 18-4100 Marine Piston for Johnson/Evinrude Outboard Motor. Condition is "New". Shipped with USPS First Class. Condition is Brand New. Includes; Piston Rings Large (2) Rings Small (2) Shaft Nothing Else Model:18-4100 Brand:Sierra Shipped with USPS First Class Package. You Will Receive 1ea 18-4100 Sierra Marine Piston for Johnson/Evinrude Outboard Motor. Condition is "New". RARE VINTAGE COLLECTIBLE Packed By Our Award Winning Packaging And Shipping Department Trusted Long Time 20 Year Plus E-commerce Seller LIMITED AVAILABILITY Inventory Box Number: 3180 SIERRA 18-4100 CROSSFLOW OUTBOARD PISTONS OMC .030 Replaces OMC 396585, 396588 Exact replacement, high silicon content aluminum alloy with the same content and weight Eliminates the need to replace all pistons unnecessarily Replace only the piston(s) required for repair Piston rings, bearings, wrist pins and circlips are all interchangeable with OEM components Sierra pistons do not require additional piston to cylinder wall clearance This allows Sierra pistons to use standard break-in and warm-up procedures Sierra 396588 Johnson/Evinrude Crossflo Pis.030 18-4100 SIER PISTON CROSSFLOW SIER PISTON CROSSFLOW Piston Kit OEM Interchange: OMC: 396585 OMC: 396588 Normalized SKU: 184100 UPC Code: 030999317346