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BPW Automatic/Manual Slack Adjuster for Trailer Truck Air Brake System, Brake Adjuster Arm. High-Performance BPW Automatic/Manual Slack Adjuster for Trailer & Truck Air Brake Systems. Durable Corrosion-Resistant Brake Adjuster Arm, Stable Performance Under Harsh Conditions. Direct Replacement for BPW OE Specs, Easy Installation & Reliable Braking Control.