His radiator cap is designed with water temperature gauge, which shows whether it is the safe temperature to open the radiator cap. It is easy to install. Just take the old cap out, and bolt on this new one.

Features:
Made of billet aluminum material for strength and durability.
Combines a radiator cap with a temperature gauge.
Measure coolant temperature to tell if it is safe to open the radiator cap.
With red silicone seal for better adaptation.
Direct bolt-on installation.

Specifications:
Pressure:0.9 BAR 
Color: Blue
Material: Aluminum Alloy
Package List:
1 * Thermostatic Radiator Cap