5/8 Heater Hose 10FT SAE J20R3 EPDM Coolant Hose with 4

Boltigen's 5/8" heater hose is a 10-foot SAE J20R3 EPDM coolant line packaged with four stainless-steel clamps for a ready-to-install, heavy-duty replacement.

This hose kit is built for automotive cooling and heater systems that need a durable, flexible line that resists heat, ozone and abrasion. The EPDM compound with spiral reinforcement meets SAE J20R3 standards and is engineered to handle typical engine coolant pressures and temperatures. The included clamps let you complete most repairs without hunting for additional hardware.

How does this hose stand up to engine heat and pressure?

The Boltigen heater hose is formulated from reinforced EPDM rubber and designed to tolerate a wide operating temperature range while maintaining shape under pressure. It carries a 100 PSI working rating and a 300 PSI burst rating for dependable performance under typical automotive loads.

• SAE J20R3 EPDM construction for heat and ozone resistance
• 100 PSI working pressure and 300 PSI burst pressure
• Operating temperature range from -40°F to 257°F

Will this hose fit my vehicle or application?

The hose is sized at 5/8" (inner diameter) and supplied as a 10-foot length that you can trim to fit most heater core lines, radiator connections, overflow and recovery tank runs. It’s suitable for passenger cars, trucks, SUVs and many industrial water-transfer uses.

• 5/8" inside diameter fits common coolant and heater lines
• 10 feet long for flexible routing and custom cuts
• Compatible with coolant, antifreeze, radiator and heater core systems

What accessories come with the hose and why do they matter?

This kit includes four stainless-steel clamps so you can install the hose immediately and achieve a tight, corrosion-resistant connection. Using quality clamps reduces leakage risk and extends service life compared with hose-only purchases.

• Four stainless-steel clamps included for immediate installation
• Clamps provide secure, leak-resistant seals on barbed fittings or pipe
• No need to buy additional hardware for most repair jobs

How easy is it to route and install the Boltigen heater hose?

The EPDM material and spiral reinforcement keep the hose flexible enough to bend around tight engine compartments while resisting kinks and collapse under vacuum or bending loads. That makes routing simpler and cuts installation time for both professional mechanics and DIYers.

• Flexible 10-foot length simplifies routing through engine bays
• Reinforced to resist kinking and maintain coolant flow
• Cut-to-fit design for custom installations and repairs

Who is this for: This Boltigen hose kit is made for vehicle owners, mechanics and fleet operators who need a reliable, ready-to-install coolant line for heater cores, radiators, overflow tanks and custom coolant routes. It’s also a practical choice for restoration projects or off-road rigs where durable, corrosion-resistant materials and included clamps speed up repairs.