Genuine Renault 20.5mm Core Plug - Ref 7703075147

The invisible risk: why neglecting your core plugs can condemn your engine

The core plug, often called a freeze plug or expansion plug, is a safety element too often ignored. By failing to replace a corroded or leaking 20.5mm diameter plug, you expose yourself to a sudden loss of coolant. On a performance vehicle like a Clio RS or Megane RS, such a failure leads to immediate engine overheating, which can result in head gasket failure or even a complete engine seizure.

Choosing not to use a genuine Renault part means taking the risk of an approximate fit. A plug that pops out under the pressure of the cooling system means an instant breakdown. Why risk thousands of dollars in repairs for a simple preventive maintenance part?

Genuine Renault quality and reliability

The 7703075147 reference meets the strictest manufacturer specifications. Unlike low-quality aftermarket products, this Renault core plug offers the thermal resistance and anti-corrosion protection required to withstand the intensive heat cycles of your engine. Its installation ensures the hermetic sealing of the casting holes in the cylinder block or cylinder head.

Frequently Asked Questions about Core Plug replacement

When should you replace a core plug?

It is mandatory to replace it at the first sign of rust or seepage. We strongly recommend systematic replacement during any engine rebuild or performance tuning to guarantee long-term watertightness.

How to properly install the 20.5mm plug?

Installation must be done with precision (press-fit). For enthusiasts in the region, Optimiz Access offers this service at our specialized workshop. Professional fitting prevents future leaks caused by misalignment.

Optimiz Access: Your Renault Sport parts expert in Northern France

Since 2010, Optimiz Access has been the preferred destination for the maintenance and personalization of sports vehicles. Based near Lille, Valenciennes, and Cambrai, we stock essential references for Renault Sport (Clio, Megane, Twingo) enthusiasts.

Whether you are in Arras, Douai, or Saint-Quentin, benefit from our technical expertise. We also ship this part with fast worldwide delivery to ensure your restoration project stays on track.

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