OUR VERDICT
Flexfab 5515 is a 3-ply blue silicone coolant hose sold in straight lengths for radiator, coolant, and heater connections. It stays flexible from -65°F to 350°F and meets SAE J20R1 Class A. Buy it for straight runs and custom coolant connections where rubber hardens and cracks. Skip it for fuel or oil; silicone isn't rated for petroleum.
WHAT WE LIKE
- Stays flexible from -65°F to 350°F
- 3-ply polyester reinforced for coolant pressure
- SAE J20R1 Class A rated
WORTH NOTING
- Not for fuel, oil, or solvent service
- Straight hose only; bends need an elbow or formed hose
Specifications
| Hose series | 5515 |
|---|---|
| Inner diameter | 3-1/8" (80mm) |
| Construction | 3-ply polyester reinforced silicone |
| Use | Coolant / Radiator |
| Format | 3 ft straight length |
| Fuel rated | No |
| Temperature range | -65°F to 350°F |