Kleinn Air Horns 6351RT replacement air tank is specifically made as a replacement tank for velcro-230 and velcro-730 train horn systems. Designed with a tank capacity of 3 gallons, it features seven 1/4-inch NPT ports. With All steel construction, this unit was manufactured to SAE J10 and FMVSS 121 standards. Internally coated with Cortex for corrosion resistance, and a black epoxy finish on the outside for added durability. Kleinn Air Horns is a U.S. Manufacturer of extremely high quality air horns, train horns, complete onboard air and air horn systems. Our focus is to bring the finest quality Pneumatic systems and components to the automotive aftermarket – worldwide. We are constantly developing new 100% bolt-on, vehicle-specific systems for today’s most popular vehicles. Kleinn also carries a complete line of air Compressors, air tanks and related Pneumatic accessories for cars, trucks, SUVs and everything else with a 12- or 24-volt power source.