The UMA Racing Bypass Tube (often referred to as the Venthose) is a high-performance breather line designed 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.
Key Features
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High-Grade Silicone Construction: Made from lightweight, heat-resistant silicone that can withstand extreme engine temperatures without softening or deforming.
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Anti-Oxidation Coating: The outer layer is treated to resist “greying” or cracking caused by UV exposure and engine oils, keeping the colors vibrant for years.
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Optimal Internal Diameter: Usually features an 8mm to 10mm inner diameter, providing the perfect balance between air volume flow and maintaining enough backpressure for efficient venting.
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Universal Length: Most kits come in a 1-meter (100cm) length, which is plenty of hose to route from the engine oil filler port to a catch tank or toward the rear of the bike.
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Neon Color Options: Available in a wide range of “pop” colors like Neon Blue, Green, Orange, Purple, and Yellow, as well as a clear version for those who want to see if any oil mist is traveling through the line.
