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Porsche > 991 (911) MK1 2012-2016 > 991.1 Carrera C2 3.4L (350 Bhp) 2012-16 > Engine Cooling > Coolant Hoses and Pipes (Front engine cars) >

Hose Clips / Screws / Brackets and Fixings

Hose Clips / Screws / Brackets and Fixings

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Water / Coolant pipe O-ring 22 x 3 mm for Porsche Various Models - 99970751740, 99970751741
1
Water / Coolant pipe O-ring 22 x 3 mm for Porsche Various Models
Special Order item
99970751741
Product Information
Product Information
Water / Coolant pipe O-ring 22 x 3 mm
This Porsche Genuine OE O-Ring (Part No. 99970751741) is a precision-engineered sealing ring (22 x 3 mm) used within the engine cooling system, specifically at water/coolant pipe connections. It is commonly referred to as a coolant pipe O-ring, water inlet O-ring, or thermostat housing seal.
Sold individually

Fits:
O-Ring 99970751741 is widely used across multiple Porsche models, including:
Porsche 911 (996 / 997 / 991)
Porsche Boxster (986 / 987 / 981 / 982)
Porsche Cayman (987C / 981C / 982C )
Porsche Cayenne (955 / 9YA)
Porsche Panamera (971 / 976)

Fitment / Position on car
•  Fitting position: Engine cooling system
•  Location: At coolant pipe joints / water inlet connections / thermostat housing
•  System: Engine cooling / coolant circulation

Cross Reference / Superseded Numbers: 99970751740 - replaced by 99970751741

The Porsche Genuine OE Coolant Pipe O-Ring 99970751741 is a small but essential sealing component used across many Porsche models. It ensures a leak-free connection within the cooling system, maintaining proper coolant flow, pressure, and engine temperature control. As a genuine Porsche part, it guarantees exact fitment and durability.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970751741
99970751740
99970751741

The product you are viewing cross references to these numbers
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About Hose Clips / Screws / Brackets and Fixings

Coolant Hose Clips, Screws, Brackets & Fixings – Secure Connections for Porsche Cooling Systems

Coolant hose clips, screws, brackets, and fixings are small but crucial components that ensure the stability, sealing, and reliability of your Porsche’s cooling system. These precision-engineered fittings keep coolant hoses and pipes securely fastened, maintaining proper coolant flow and preventing leaks — even under extreme temperature and pressure conditions.

At Design911, we stock a complete selection of genuine and manufacturer-quality coolant hose clips, screws, brackets, and fixings for Porsche 911, Boxster, Cayman, Cayenne, Macan, and Panamera models. Each component is engineered for exact fitment, corrosion resistance, and long-term strength — ensuring every hose and connection performs to factory standards.

What Do Coolant Hose Clips and Fixings Do?

These parts form the structural foundation of your Porsche’s cooling system. Their primary functions include:

  • Securing coolant hoses and pipes in place to prevent movement or detachment.
  • Maintaining tight, leak-free connections under varying thermal pressures.
  • Supporting cooling system alignment through brackets and clips.
  • Protecting hoses from vibration damage or contact with moving components.

Together, these fasteners help ensure reliable coolant circulation and stable engine temperatures — vital for your Porsche’s performance and longevity.

Why Do Clips, Screws, and Fixings Fail?

Even the smallest cooling system parts are exposed to significant wear over time. Common causes of failure include:

  • Corrosion or rust from heat and coolant exposure.
  • Metal fatigue or cracking under repeated thermal expansion.
  • Loss of tension in hose clamps, leading to leaks.
  • Plastic degradation on older or high-mileage vehicles.
  • Vibration damage loosening brackets or screws.

Symptoms of failure include coolant leaks, rattling noises in the engine bay, or hoses slipping from their fittings.

Why Replace Faulty Coolant Hose Fixings?

Replacing worn or corroded clips and brackets is essential to maintain cooling efficiency and prevent costly engine damage from leaks or overheating.

Benefits of replacement include:

  • Restored, secure hose and pipe connections.
  • Prevention of coolant leaks and pressure loss.
  • Improved cooling system integrity and safety.
  • Manufacturer-quality construction for long-lasting performance.

All components in this range are made from high-grade materials — including stainless steel and reinforced polymers — designed to exact specifications for strength, corrosion resistance, and precision fitment.

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