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Fleetrunner Vulco® Flex Radiator Hose

The Vulco® Flex hose can replace a multitude of curved hose sizes and shapes on a range of trucks, busses, and heavy-duty vehicles. Together with Gates' straight and curved radiator hoses, this flexible quality hose allows optimum market coverage. Flexible radiator hose with built-in spiral wire. Approved for Heavy-Duty and Marine applications. It is a permanent replacement hose, equalling the performance of molded hose.

  • Engineered to resist electrochemical degradation, the leading cause of hose failure.
  • The built-in steel spiral allows for medium sized curves without kinking or collapsing.
  • Polyester fabric ply reinforcement vulcanizes into shape without unnecessary strain on connections.
  • Resistant to coolants, oil and ozone.

All Parts

1-10 of 42 Items
Part # Product # Description Hose Inside Diameter (in) Hose Inside Diameter (mm) Weight Per ft
26601 42840001 26601 GS VULCO-FLEX 1.75 44 0.28
26602 42840005 26602 GS VULCO-FLEX 1.75 44 0.42
26603 42840032 26603 GS VULCO-FLEX 1.75 44 0.6
26611 42840015 26611 GS VULCO-FLEX 1.75 44 0.98
26612 42840017 26612 GS VULCO-FLEX 1.75 44 1.24
42840101 26512 GS VULCO-FLEX 2 51 1.55
42840102 26519 GS VULCO-FLEX 2.25 57 0.61
42840103 26520 GS VULCO-FLEX 2.25 57 0.73
42840104 26521 GS VULCO-FLEX 2.25 57 0.92
42840105 26522 GS VULCO-FLEX 2.25 57 1.11
1-10 of 42 Items


Whether you're working on a construction site or sending fleets across the country, maintaining the proper engine temperature is critical to ensure your trucks, busses, and vehicular equipment run properly. Our heavy-duty coolant hoses are designed for superior resistance to corrosion, chemicals, and high-operating temperatures, and they're tested to stand up to some of the most challenging applications in the industry.

Features and Benefits

  • Extra strength fabric reinforcement with helical steel wire spiral molded between tube and cover.
  • EPDM tube and neoprene cover for extended service life.
  • Heat-resistant construction throughout.
  • Caution: Do not use for fuel or oil transfer applications.


As part of our Be System Part initiative, we recommend regularly inspecting your critical vehicle systems, including your cooling system and hoses, at around 60,000 miles. As your coolant hose begins to age, the constant transfer of chemical fluids will corrode your hose from the inside out. When inspecting your coolant hose, there are a few simple signs that it's ready for replacement: Press for Soft Spots. The radiator hose is naturally rigid, and any soft spots along the hose body indicates the inner material has begun to break down. Firmly press on the hose body to feel for potential deterioration. Check the Ends and Fittings. Look for cracks around the hose end, especially near the hose clamps. Feel for Bulges. Run your hands along the hose body to feel for protruding materials, which indicate a rupture within the hose that will eventually lead to failure.