The Kleinn Model 6270RT is a heavy-duty steel replacement air tank and specifically engineered as a direct fitment for the Kleinn 6270 onboard air system, the GMTRK-3 vehicle-specific kit, and the ProBlaster HK3 and HK4 train horn kits. Built for extreme durability and long-lasting pneumatic performance, this premium tank features a multi-port configuration designed so that no matter how you orient or mount it on your vehicle's chassis, a convenient moisture drain port is always accessible on the bottom to safeguard your system against internal rust and contamination.