Sierra 18-0659 Pressure Control Valve O-Ring for Yamaha Outboard Engines

The Sierra 18-0659 is a replacement pressure control valve O-ring engineered to meet or exceed original equipment manufacturer (OEM) specifications. Designed for use on Yamaha 40–70HP and 200–300HP outboard engines (all models and years), this O-ring provides a reliable, leak-free seal at the pressure control valve — a critical component in maintaining proper fuel and fluid system integrity.

Sierra International is a trusted name in marine replacement parts, delivering aftermarket components that match OEM fit and function at a competitive value. This O-ring is manufactured from durable, marine-grade elastomer material engineered to withstand the demanding temperature and pressure cycles found in outboard engine applications.

Key Features:

• Meets or exceeds OEM specifications for a direct-fit replacement
• Compatible with Yamaha 40–70HP and 200–300HP outboard engines, all models and years
• Replaces Yamaha OEM O-ring part numbers (see cross-reference below)
• Engineered for reliable sealing performance at the pressure control valve
• Marine-grade elastomer construction for resistance to fuel, oil, and heat
• Easy drop-in installation with no modification required

Whether performing routine maintenance or addressing a leak at the pressure control valve, the Sierra 18-0659 O-ring is a cost-effective, OEM-quality solution for keeping your Yamaha outboard running at peak performance.