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SKU: 28409 | UPC: 072053081183
Gates 3/8in x 50 ft SS Heater Hose
The Gates 28409 is a premium 3/8" x 50 ft straight heater hose designed for reliable coolant and heater system performance in automotive, light truck, and heavy-duty applications. Part of Gates' premium Straight Silicone (SS) series, this hose is constructed from high-temperature silicone rubber reinforced with 4-ply polyester fabric for exceptional durability, flexibility, and heat resistance. Rated for continuous operation up to 350°F (177°C) and intermittent spikes to 400°F (204°C), it resists coolant additives, ozone, weathering, and aging. The smooth bore reduces flow restriction, while the thick wall construction prevents collapse under vacuum or high pressure. Ideal for heater core, radiator bypass, or custom coolant routing in performance, classic, or heavy-duty vehicles where stock rubber hoses fail prematurely.
Key Features & Benefits
- High-Temperature Silicone Rubber Handles up to 350°F continuous / 400°F intermittent for extreme heat conditions
- 4-Ply Polyester Reinforcement Provides superior burst strength and flexibility without kinking or collapsing
- 3/8" Inner Diameter x 50 ft Length Versatile sizing for heater lines, coolant bypass, or custom routing
- Smooth Bore Design Minimizes flow restriction and improves coolant/heater efficiency
- Gates Quality Engineered for long service life and resistance to coolant chemicals, ozone, and weathering
| Specification | Detail |
|---|---|
| Part Number | 28409 |
| Brand | Gates |
| Application | Heater, coolant, bypass, or custom lines |
| Material | Silicone rubber with 4-ply polyester reinforcement |
| Inner Diameter | 3/8 inch (9.5 mm) |
| Length | 50 feet (15.24 meters) |
| Temperature Range | -65°F to +350°F continuous (-54°C to +177°C); up to +400°F intermittent |
| Burst Pressure | High (typical silicone rating – exceeds most OEM requirements) |
| Color | Black (standard Gates SS series) |
Whats Included
- One 50 ft continuous length of 3/8" Gates Straight Silicone Heater Hose
Product Notes
- Exceeds SAE J20R3 Class A requirements for high-temperature coolant/heater hoses
- Resists coolant additives, oil mist, and environmental degradation better than standard rubber hoses
- Ideal for performance, classic car, or heavy-duty applications where heat and longevity are critical
- Cut to length as needed use Gates hose clamps or spring clamps for secure connections
- Black silicone appearance with Gates branding for professional look
Installation Notes
- Estimated time: 30-90 minutes (depending on routing)
- Drain coolant, remove old hose, and clean fittings
- Cut Gates hose to required length, slide over fittings, and secure with proper clamps
- Refill coolant, bleed air from system, and check for leaks
- Professional installation recommended for complex routing or pressurized systems
This Part Fits
| Year Range | Make | Model | Engine | Notes |
|---|---|---|---|---|
| Universal | Universal | Universal | Universal | 3/8" ID fits most heater core, bypass, or coolant lines – measure existing hose diameter for compatibility |
Why Choose Gates Straight Silicone Heater Hose?
- Superior heat resistance and longevity compared to standard rubber hoses
- Reinforced construction prevents collapse under vacuum or high pressure
- 50 ft bulk length offers flexibility for multiple repairs or custom projects
- Gates trusted global leader in fluid power and hoses since 1911
Frequently Asked Questions
-
Q: Is this hose flexible enough for tight bends?
A: Yes, silicone with polyester reinforcement remains flexible even at low temperatures while resisting kinking. -
Q: Can I use this for radiator hoses?
A: Yes, suitable for heater, bypass, or low-pressure coolant lines; for high-pressure radiator hoses, use Gates Green Stripe or Silicone Radiator Hose series. -
Q: Does it require special clamps?
A: Standard worm-gear or spring clamps work well; use Gates Power-Grip or T-bolt for high-performance applications.
Shipping and Handling
- Method: UPS / FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 8-10 lbs (50 ft bulk hose)
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