Sierra 18-99216 Looper for Mercury/Mariner Outboards

The Sierra 18-99216 is a replacement looper designed for Mercury and Mariner outboard engines. This critical cooling system component directs water flow through the engine's powerhead to maintain optimal operating temperatures and prevent overheating damage.

Key Features:

• Precision-engineered to meet or exceed OEM specifications
• Manufactured from corrosion-resistant materials for durability in harsh marine environments
• Direct replacement for Mercury/Mariner OEM parts
• Designed for CD4 and CD8 outboard engine models
• Ensures proper coolant flow and engine temperature regulation

Sierra Marine is known for producing high-quality aftermarket parts backed by their industry-leading warranty. This looper provides reliable performance at a competitive price point compared to OEM components.