I bought a replacement aluminum heatsink, but it had an unused nipple that I had to cover with a cap. I used to try rubber caps at the parts store and they always snapped shortly after installation. I put this silicone plug on the radiator pipe with a clamp. Driven more than 100 km, no cracks or blisters. I will update my review if there is an error. Now I have 9 spare parts.
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