5/16″ × 25′ Transmission Repair Hose

Restore factory fit and cooling performance to your transmission lines with the 4LifetimeLines® 5/16″ × 25′ Transmission Repair Hose. This premium-grade hose is designed to handle automatic transmission fluid (ATF) at high temperatures and pressures, making it ideal for radiator cooler loops, oil-to-air coolers, and custom plumbing runs on cars, trucks, and performance builds.

Engineered for Durability

Constructed from a synthetic rubber compound that resists swelling, cracking, and kinking, this hose maintains flexibility down to –40 °F and up to 275 °F, even under constant heat exposure. The crush-resistant reinforcement layer prevents collapse when clamped or bent, while the smooth inner bore ensures unrestricted ATF flow and consistent cooling efficiency.

DIY-Friendly Length and Compatibility

With a full 25-foot coil, you have plenty of hose to replace both supply and return lines on most domestic and import vehicles without splicing. The 5/16″ inner diameter matches OEM cooler fittings and aftermarket unions, so you can slip on standard barbed adapters, secure with stainless-steel clamps, and restore leak-free operation in minutes.

Installation & Use

Cut the hose cleanly with a fine-tooth blade or hose cutter, slip on your chosen fittings, and clamp firmly to the transmission cooler or radiator port. Because the material resists degradation from ATF additives, you won’t have to worry about premature hose failure. Finish by routing away from sharp edges and exhaust heat—then enjoy worry-free takes on the highway or track.

Ready to fix that pesky transmission leak? Add the 5/16″ × 25′ Transmission Repair Hose to your cart today and get back on the road with confidence.