Boltigen 3/8 in Transmission Oil Cooler Hose — 20ft, 300 PSI, SAE J1532

Boltigen's 3/8" ID transmission oil cooler hose is a 20-foot, SAE J1532-compliant line built to connect oil coolers, power steering, and hydraulic systems at up to 300 PSI while resisting heat, oil, and abrasion.

This heavy-duty cooler hose is made for mechanics, fleet technicians, and DIYers who need a reliable link between a vehicle's transmission or power steering system and its external cooler. Constructed with an inner polyester braid and a CPE outer cover, the hose delivers long service life across a broad temperature range and meets SAE J1532 standards for transmission cooler lines.

How does this hose handle pressure and extreme temperatures?

The Boltigen cooler line is engineered for demanding conditions: it has a 300 PSI working pressure and a 1800 PSI burst rating, providing a large safety margin for hydraulic and transmission applications. It also tolerates climates and engine bays from -40°F up to 302°F, making it suitable for cold starts and high-heat environments.

• Rated working pressure: 300 PSI for everyday operation.
• Burst pressure: 1800 PSI for safety under surges.
• Temperature range: -40°F to 302°F for season-spanning reliability.

What fluids and systems is this 3/8" hose compatible with?

This line is compatible with common automotive and industrial fluids including transmission fluid, engine oil, hydraulic fluid, lubricants, and gasoline. Its materials resist chemical attack and swelling, so it can be used for power steering, transmission oil coolers, and other cooling or hydraulic circuit connections.

• Suitable fluids: ATF, gear oil, hydraulic fluid, lubricants, gasoline.
• Applications: transmission oil cooler lines, power steering cooler connections, hydraulic cooling loops.
• Material resistance: chemical and oil-resistant CPE outer cover and reinforced inner braid.

What are the hose dimensions and construction details?

The Boltigen cooler hose has a 3/8 inch (9.5 mm) inner diameter, approximately 0.67 inch (16.5 mm) outer diameter, and ships as a 20-foot length to cover long runs or multiple installations. A polyester braid reinforcement provides strength and flexibility while the weather- and oil-resistant CPE outer layer protects against abrasion and environmental damage.

• Inner diameter: 3/8" (9.5 mm); outer diameter: ~0.67" (16.5 mm).
• Length: 20 feet—enough for long chassis runs or spare stock.
• Construction: polyester braid reinforcement with CPE outer cover for durability.

How does this hose meet professional standards and installation needs?

Manufactured to SAE J1532 specifications, this hose aligns with industry expectations for transmission oil cooler lines, offering installers confidence in performance and safety. The hose's flexible profile eases routing around engine components and its abrasion-resistant cover reduces chafing where it contacts brackets or chassis metal.

• Standards: SAE J1532 compliant for professional use.
• Installation: flexible for tight routing and engine-bay installations.
• Durability: abrasion-resistant outer cover reduces wear during service life.

Who is this for? Boltigen's 3/8" ID transmission oil cooler hose is aimed at automotive professionals, restoration shops, off-road vehicle builders, and knowledgeable DIY mechanics who need a dependable, standard-compliant line for transmission coolers, power steering coolers, or hydraulic circuits. If you require a 20-foot hose that balances flexibility, high-temperature tolerance, and proven pressure ratings for fluid cooling or hydraulic connections, this hose is a practical, ready-to-install option.