Porsche Valve Steel.

Here's a breakdown of its components:

Valve stem: The long, cylindrical part that extends from the tire valve to the rim. It allows air to flow into and out of the tire.

Nut: A threaded nut that secures the valve stem to the rim.

Washer: A rubber or metal washer that provides a seal between the valve stem and the rim, preventing air leaks.

Specifications:

Size: 5.5mm (This refers to the diameter of the valve stem)

Material: Steel (Indicates a durable and corrosion-resistant construction)