3/4in to 5/8in STR Reducer Hose Black

The 3/4in to 5/8in STR Reducer Hose Black from SAMCO SPORT is a precision-engineered silicone radiator hose designed for serious engine builders and performance mechanics. This hose is particularly useful for those working on turbocharged and high-heat cooling systems, serving as a critical transition component between larger-diameter upper or lower radiator passages and smaller-diameter secondary cooling lines.

Constructed from reinforced silicone, this straight reducer hose is built to withstand high temperatures, rated for continuous use up to 250°F. Its black finish resists UV damage, maintaining its appearance in aggressive under-hood environments. The multi-ply weave construction prevents ballooning under pressure spikes, ensuring reliability in forced-induction applications.

This hose is ideal for custom engine bay layouts, intercooler plumbing, and thermostat housing modifications. Performance enthusiasts will appreciate its optimal flow geometry, which minimizes turbulence and reduces the risk of hot spots that can compromise cooling efficiency. At just 0.11 lbs, it adds negligible weight, making it suitable for tight engine bays where space is at a premium.