Sierra O-Ring for Pressure Control Valve, Part Number 18-0659

This is a genuine Sierra O-ring engineered specifically for the pressure control valve on marine engine applications. It is designed as a direct seal replacement, restoring proper sealing at the pressure control valve where an original O-ring has hardened, cracked, or lost its seal over time. As a small, single-component seal, its role is simple but critical: prevent pressure loss and leakage at the valve interface, helping the pressure control valve function as intended. Each unit is sold as a single O-ring identified by Sierra part number 18-0659.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0659
• Item Type: O-Ring, Pressure Control Valve
• UPC: 808282388775
• Weight: 0.01 pounds
• Quantity: 1 O-ring per pack

Frequently Asked Questions

What is Sierra part 18-0659 used for? Sierra 18-0659 is an O-ring designed to seal the pressure control valve on a marine engine, replacing a worn or damaged original seal.

How many O-rings come in one order of 18-0659? Each order of Sierra 18-0659 includes one O-ring, sold as a single unit for one pressure control valve.

Is 18-0659 a genuine Sierra part? Yes, 18-0659 is a genuine Sierra O-ring, not a generic or universal seal, made specifically for the pressure control valve application.

How much does the 18-0659 O-ring weigh? The Sierra 18-0659 O-ring weighs 0.01 pounds, reflecting its small size as a single seal component.

What is the UPC for Sierra 18-0659? The UPC for the Sierra 18-0659 pressure control valve O-ring is 808282388775.

When should I replace the pressure control valve O-ring? Replace the O-ring on the pressure control valve, such as Sierra 18-0659, if you notice a loss of pressure, fluid seepage around the valve, or a visibly cracked or flattened seal.

Does 18-0659 include the pressure control valve itself? No, this part covers only the O-ring seal for the pressure control valve, not the valve body or assembly itself.

Can 18-0659 be used as a general-purpose O-ring? Sierra 18-0659 is manufactured specifically for the pressure control valve application rather than as a generic all-purpose seal.

Is installation of the 18-0659 O-ring simple? Installing the Sierra 18-0659 O-ring is a straightforward seal replacement at the pressure control valve, requiring removal of the old O-ring and seating the new one in its place.

Why choose the Sierra 18-0659 over a generic O-ring? The Sierra 18-0659 is sized and specified for the pressure control valve, so it fits and seals correctly where a generic O-ring may not match the required dimensions.