The Type-A radiator cap is perfect for 2015 - 2021 Subaru STI and WRX models. It's a key part of an upgraded cooling system. Radium caps are designed to boost cooling efficiency safely by controlling the boiling temperature. Higher radiator pressure raises the coolant's boiling point, giving you extra safety and preventing air pocket cavitation at the water pump. Specs: 1.3 BAR (18.9 psi), steel cap with electroplated black finish, premium silicone sealing elements for long - lasting use, and it's designed for mini size (32mm ID) radiator necks only. This item isn't application - specific, so check compatibility before buying.

Using this radiator cap is easy. Just remove your old radiator cap and replace it with this Radium Engineering Type - A cap. Make sure it's firmly in place. Before buying, always double - check if it fits your vehicle model. When it comes to maintenance, keep an eye on the sealing elements. If you notice any signs of wear or leakage, it might be time to replace the cap. Also, don't over - tighten the cap as it could damage the radiator neck. Keep your cooling system in top shape with this reliable radiator cap.