3697436f Corrosion-Resistant Bypass Water Hose Designed for SCR System Coolant Circulation in Qsl9.3/Qsx15 Cummins Engines

The 3697436F Bypass Water Hose is a specialized OEM cooling system component engineered exclusively for diesel engines, covering a wide range of applications including heavy-duty on-highway vehicles, off-highway machinery, and stationary industrial generators. As a critical part of the engine's coolant circulation system, its core function is to create a "bypass" pathway for engine coolant—directing a portion of the fluid around the radiator during cold starts or low-load operations, accelerating engine warm-up to reach optimal operating temperature faster.

Durability is a standout feature of this bypass hose. The EPDM rubber inner tube resists coolant degradation and thermal aging, maintaining flexibility even after 5,000+ hours of exposure to temperatures ranging from -40°C to 130°C. The polyester braided reinforcement adds structural rigidity to withstand vibration from heavy-duty engine operation, preventing hose kinking or separation.

• Withstands vibration up to 2,000 Hz.
• Rigorous 1,000-hour pressure cycling (10 bar to 0 bar).
• 500 thermal shock cycles validated.
• Service life up to 80,000 kilometers or 6,000 operating hours.