- UMA Racing Bypass Tube (often referred to as the Venthose) is a high-performance breather line is made of High-Grade Silicone to work in tandem with the UMA Bypass Valve. While a standard rubber hose might collapse under vacuum or melt near the engine, this tube is engineered specifically for the harsh environment of a high-RPM crankcase system. It is a vital component for any engine that has been “bored up” or modified, as it ensures that excess internal pressure is vented safely and reliably.
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