Features: 1. Monitor the coolant level of the cooling system and transmit information to ECM via engine harness.2. Use this Coolant Level Sensor to directly determine the amount or absence of coolant liquid without having to open the lid or inspect it on the spot.3. Check the coolant level of the vehicle to protect the engine effectively.4. Easy to install, no complex tools required, installed on the cooling tank or expansion tank.5. Manufactured to original OEM specifications, the reference party number is 93179551. Specifications: Material: ABS plastic Color: Black Manufacturer Part Number: 93179551 Size: Approx. 4.3 x 2.1 x 7.3cm / 1.69" x 0.83" x 2.87" Package Weight: Approx. 23g Fitment: For Opel Astra H 2004 For Opel Astra Estate 2004 For Opel Astra GTC 2005 For Opel Zafira (205) 2005 For Opel Astra H Twintop 2005 For Opel Astra H Saloon 2007 For Opel Astra H Van 2004 For Opel Zafira Van 2005 Package Included: 1 x Coolant Fluid Level Sensor Note: 1. Please check the photo and part numbers to make sure it matches with the product you are replacing before you purchase. 2. Please allow 1-3cm error due to manual measurement. Thanks for your understanding.