The Parker Pumper Fresh Air System consists of 3 parts. a motor assembly (#ALL13000) draws air from inside the driver compartment. Air then travels through the cool pack (#ALL13003), and then to the helmet. The cool pack utilizes blocks of ice to cool the aluminum exchanger and the air passing over it. a 4 or 6 foot long hose (#ALL13004 or #ALL13006) completes the system. (Note: Do not use dry ice in cooler unit as it can cause severe burns. ) Parker Pumper Cool Pack #13003