A device, system and method are disclosed for locating clean channels for upstream data carriers that are certain to have lower noise levels than the currently utilized channel used for carrying data upstream, thereby enabling intelligent placement of an upstream data carrier in a cable television system utilizing cable modems for two-way data transmission. The assembly includes a compressible thermal pad, a thermal plate, and a clip. An on-board shut-off unit stops the device when it is removed by the athlete chasing the device. A single slot has a 50-pin connector for CompactFlash cards or passive adapters. The filtrate obtained from the dewatered sludge, which contains the greater part of the nitrogen load, is introduced into the aerobic purification zone in the purification plant and is subjected to nitrificationdenitrification therein. The valve also includes axially extending grooves in the inner surface of the tubular housing in the area of a actuating piston bore to relief stresses in that area thereby reducing the risk of stress failure.