Manual Air Reservoir Drain Valve: Durable manual-style valve for quick draining of air tanks; ideal for heavy-duty truck & trailer air brake systems with convenient 5-foot pull cable for remote access. 1/4” NPT Male Thread Port: Designed with a 0.25-inch NPT male thread for secure, leak-resistant installation on compatible air reservoirs—ensuring safe and efficient operation in demanding environments. Rugged 5-Foot Pull Cable: Comes with a factory-installed 5-foot steel pull cable, allowing operators to actuate the valve easily without crawling under the vehicle. Universal Truck & Trailer Fit: Engineered for wide compatibility with Freightliner, Mack, Volvo, Kenworth, Peterbilt, and more—direct OE replacement across various fleets and platforms. Replaces 50+ OE & Aftermarket Parts: Cross-references top brands like Haldex, Phillips, Velvac, Automann, Tectran, and Meritor—replaces part numbers including 12105, 12-820, PHI12-820, R12105, M1322.