Mercury Top Cowl PFWH - 100-8M0119289. Protect your engine while maintaining its factory look with the Mercury Top Cowl PFWH 100-8M0119289. This genuine OEM replacement top cowl provides a durable, snug-fitting shield for your Mercury outboard's powerhead, helping defend against salt, debris, UV rays, and impact damage while preserving performance and appearance.. Key Features. Genuine Mercury OEM part - Built to exact factory specs for a precise fit. Durable protective housing - Shields the powerhead from external damage. Marine-grade construction - Withstands harsh weather, corrosion, and UV exposure. OEM finish and color - Maintains your engine's professional, factory look. Part number 100-8M0119289 - Ensures accurate identification and compatibility. Compatibility. The Mercury Top Cowl PFWH 100-8M0119289 is designed to fit specific Mercury outboard motors. To confirm it's the right match for your engine, always refer to your model's parts catalog or consult with a Mercury-certified