This Super Flexible hose is a coolant / heater hose that is mandrel made in continuous lengths up to 130 feet, the longest length and most flexible silicone hose available in the industry. This hose is resistant to coolant solutions, cracking, ozone, cold leaks, peeling and aging. This product is made for extreme applications that require tight bends for connections between the radiator and the engine on heavy-duty equipment, buses, trucks, etc. The X-treme Plus SF has a Greek corrugated construction that allows this hose to be flexible enough to replace pre-formed elbows.