Flexfab 5780-300, 3.00" x 3 ft, High Temp Red Silicone Meta-Aramid Coolant Hose, 76mm

Run coolant where standard silicone gives out with the Flexfab 5780-300 high-temperature meta-aramid hose. Its thicker 4-ply wall and meta-aramid reinforcement push the temperature ceiling to a remarkable +500°F while handling up to 80 PSI working pressure — built for the hottest, most hostile cooling systems across diesel, automotive, marine, agricultural, and industrial engines.

Why this Flexfab high-temp coolant hose

• −65°F to +500°F range — far beyond standard 350°F coolant hose, which means it survives next to turbos, manifolds, and EGR routing.
• Silicone + meta-aramid, 4-ply — the aramid reinforcement adds heat and pressure endurance ordinary polyester can’t match.
• 250 PSI actual burst / 80 PSI working — a wide safety margin for high-pressure cooling circuits.
• Meets or exceeds SAE J20 R1 H.T. — documented high-temperature spec compliance.
• 3.00" (76mm) ID × 3.5" (89mm) OD, 0.22"–0.279" wall — thicker wall for pressure endurance.

Supplied as a 3-foot stick, this red hose resists hardening, cracking, aging, and chemical attack including coolant additives.

Backed by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.

• FlexFab Series: 5780
• Part Number: 5780-300
• Inside Diameter (ID): 3.00" (76mm)
• Outside Diameter (OD): 3.5" (89mm)
• Hose Length: 3 feet
• Wall Thickness: 0.22" / 0.279"
• Working Pressure - PSI: 80
• Actual Burst Pressure - PSI: 250
• Standard: SAE J20 R1 H.T.
• Extreme temp range: -65F to +500F
• Construction: Red Silicone hose with Meta-Aramid 4-ply reinforcement