Gates 28203 45-Degree Molded Silicone Coolant Hose Elbow

The Gates 28203 is a 45-degree molded silicone coolant hose elbow engineered for severe-service, high-heat cooling system applications. Designed to meet the demands of modern heavy-duty engines — particularly those with advanced emissions systems from 2007 and newer that generate elevated under-hood temperatures — this hose delivers long-lasting performance where standard rubber hoses fall short.

Key Features:

• Premium 4-ply silicone construction provides exceptional burst strength and superior service life
• Extra-thick, flexible silicone tube prevents cold-water leaks and resists hardening under sustained heat exposure
• High-grade silicone cover resists coolants, ozone, weathering, sunlight, and extreme ambient temperatures
• Temperature range: -65°F to +350°F (-54°C to +177°C) for reliable performance in extreme thermal environments
• Engineered to resist electrochemical degradation (ECD) — the leading cause of coolant hose failure
• Meets SAE 20R3 Type EC Class D-1 and D-2 specifications
• High-heat resistance material meets or exceeds OE specs
• Ideal for use near high heat sources such as exhaust systems, turbocharger hot-side plumbing, and low-airflow engine compartments
• Compatible with coolant, water, and air transfer applications

The Gates 28203 silicone coolant hose is part of Gates' Severe Service silicone hose lineup, purpose-built for heavy-duty trucks, buses, and commercial vehicles operating in demanding thermal conditions. Gates also offers a full range of application-specific molded silicone coolant hoses for exact OEM dimensional fitment.