The invention describes a technique for reusing radio frequencies, i. The system has a coolant that cools the device with the involvement of an air-conditioning system that serves for air-conditioning of the vehicle passenger compartment. The device also includes a novel adjustable flow rate control assembly that is disposed intermediate the fluid reservoir outlet and the outlet port of the device for precisely controlling the rate of fluid flow from the outlet port toward the patient. Due to the transverse formations, fluid contained within either tube at one end portion thereof cannot flow through the length thereof to displace a less dense fluid contained therein at the other end portion thereof under gravitational flow. The chamber case of a brake chamber of a vehicle is configured to surround a power spring and a piston, and a top portion of the chamber case is formed to have a relatively greater thickness than a side portion thereof to reinforce the strength of the chamber case.