Navistar SMR14268 Universal Drain Valve Assembly Automatic Self-Closing, Heavy Duty drain valve for air brake system air tanks comes with a 5' steel operating cable. Utilizes a stainless steel spring to eliminate corrosion. The nylon covered steel cable is cut to length and ready to install. The valve has a low profile installation to minimize exposure to breakage. This drain valve has a 1/4 NPTF male thread.