Flex Technologies HH-112X25 1-1/8 in I.D. Blue Silicone Heater Hose | 25 Foot Roll

Flex Technologies HH-112X25 silicone heater hose — 1-1/8 in (1.125 in) inside diameter, 25-foot roll, blue. Single-ply polyester-reinforced silicone construction meeting SAE J20 R3 heater-hose service. Used as a cut-to-length replacement for stock rubber heater hose on Class 8 trucks, RVs, marine engines, and industrial coolant / heat-transfer plumbing where rubber tends to harden and crack from underhood heat cycling.

Specifications

Applications

Use this hose for:

• Heavy-duty truck heater core supply / return lines and underhood coolant runs
• RV, motorhome, and bus heater plumbing
• Marine engine coolant / heat-transfer lines
• Industrial machinery and generator heat-transfer hose runs
• Replacement for hardened or cracked OEM rubber heater hose

Installation tips: Cut hose square with a sharp blade. Use constant-tension or T-bolt clamps rated for silicone hose — do not over-torque worm-drive clamps on silicone. Route away from exhaust components and sharp edges; inspect annually for abrasion at any clamp or guide.

Verify hose I.D., wall thickness, and routing length against the existing hose run before ordering. Silicone hose requires silicone-compatible clamps for a long-lived seal.