Genuine 99970715440 Engine Crankcase Breather O-Ring

Engine Crankcase Breather O-Ring for Porsche

This Genuine engine crankcase breather O-ring is a direct sealing component for the breather hose connector on the engine. It is used on select Porsche Boxster and Porsche 911 applications to maintain a secure seal at the crankcase breather connection.

Key Features

• Genuine replacement part for the engine crankcase breather connection
• Fits 1997-2004 Porsche Boxster, at breather hose connector on engine
• Fits 1999-2002 Porsche 911, at breather hose connector on engine
• Fits 2003 Porsche 911, at breather hose connector on engine; to chassis 09950
• Part number 99970715440 for accurate ordering and fitment lookup

Detailed Description

Part number 99970715440 is an OE-style sealing ring used at the engine breather hose connector. On Porsche Boxster and Porsche 911 models, this O-ring helps maintain the seal where the breather hose connects to the engine, supporting proper crankcase ventilation system integrity. If you are replacing a worn or flattened seal during breather hose service, this Genuine 99970715440 O-ring is the correct service part for the listed applications.

This part cross-references 99970715440 for the same application.

What It Is Used For

• Replacing a hardened or flattened breather connector seal
• Correcting oil seepage at the crankcase breather hose connection
• Restoring a tight seal at the engine breather hose connector
• Addressing vacuum leaks related to the crankcase breather connection
• Servicing Porsche Boxster and Porsche 911 breather system components

Installation Notes and Tips

Install at the breather hose connector on the engine as specified by the vehicle application. Clean the sealing surfaces before installation and inspect the connector and hose for wear, cracking, or distortion that could affect sealing. Verify the chassis break noted for the 2003 Porsche 911 application before ordering.

Quality Assurance

Genuine replacement part built for the listed Porsche applications. Confirm fitment by year, model, and chassis note before installation.