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When replacing a tire, a tire technician should always replace the valve stem to ensure there are no issues with the tire changing process. Valve stems over time will age which could cause a flat tire. The TR438 valve stem is small rubber valve stem to fit in spare tire.
Compliance and Restrictions
Timely delivery and easy installation.
Mercedes uses an uncommon size valve stem in their spare tire wheels (.350"). The TR438 is a perfect fit and saves about $15 per valve stem compared to purchasing from Mercedes.