Pneumatic system components install into compressed air systems and support the operation of air-powered equipment and tools. Exhaust breather vents, mufflers, and silencers control noise generated by exhausting compressed air. Pneumatic check valves limit the flow of compressed to air to one direction, preventing backflow and pressure loss. Air fuses automatically stop air flow when air flow rates rapidly increase beyond a selected volume. Air and liquid bypass valves allow service and inspection of air systems without downtime. Zero-loss condensate drains remove accumulated moisture in a compressed air system without losing pressure. Float operated drain valves mechanically open when condensate volume reaches a selected level, emptying the condensation from a tank. Air-operated drain valves remove condensate from compressors, air dryers, receivers, aftercoolers, and filters. Timed electric drain valves automatically remove condensation from compressed air systems at scheduled intervals.