Genuine OEM Volkswagen Air Conditioning Protective Cap, part number 8A0820871AB. This cap is designed to seal and protect the low-side service port of the air conditioning system. It prevents the ingress of dirt, moisture, and other contaminants, which can compromise AC system performance and longevity. Made from durable black plastic, this cap ensures a secure fit. Using a genuine OEM protective cap guarantees the correct thread, seal, and material quality for reliable long-term protection of the AC system.