Boost Monkey 3.5mm ID Silicone Vacuum Hose Replacement for

Boost Monkey 3.5mm ID silicone vacuum hose — a 10-foot, high-quality replacement designed to match BMW part #117312599965 and restore reliable vacuum routing.

If your BMW needs a dependable vacuum line that resists heat, oil, and aging, this Boost Monkey silicone hose is sized and engineered for automotive vacuum systems. With a 3.5mm (9/64") inner diameter and a full 10-foot length, it provides enough run for routing, repairs, or custom vacuum manifold work while maintaining flexibility and long-term durability.

Will this hose fit my BMW and replace part #117312599965?

Yes — the Boost Monkey hose is made to the same inner diameter specification as BMW part #117312599965 so it fits existing vacuum fittings and clamps intended for that part. Measure your existing line to confirm the 3.5mm inner measurement and check for any specific connector types used in your application.

• Exact inner diameter: 3.5mm (9/64").
• Length: 10 feet for multiple runs or spares.
• Compatible with OEM-style vacuum fittings commonly used on BMW engines.

How does silicone construction benefit performance in engine bays?

Silicone provides superior resistance to temperature extremes, ozone, and many automotive fluids compared with ordinary rubber tubing. That means the hose stays pliable in cold starts and won’t harden or crack quickly under high under-hood temperatures, improving long-term vacuum integrity.

• Higher heat tolerance than standard rubber lines.
• Resists oil, coolant vapors, and ozone-related degradation.
• Maintains flexibility across wide temperature ranges.

What lengths and routing options does a 10-foot hose allow?

A 10-foot spool gives you enough material for multiple short repairs, a single long run, or custom vacuum routing for boost controllers, EVAP systems, or vacuum reservoirs. You can cut to length for precise installs and keep spare sections for future maintenance.

• Cut-to-fit for tailored routing and clean connections.
• Enough hose for spares or multiple repair points on a single spool.
• Useful for retrofit or custom vacuum plumbing tasks.

How should I install and secure this replacement hose?

Cut the silicone hose cleanly with a sharp blade or tubing cutter and slide appropriately sized clamps or OEM-style fittings over the ends. Ensure a snug fit on nipples and use small worm-drive or ear clamps where space permits to prevent leaks under vacuum.

• Use a clean, straight cut for leak-free connections.
• Select clamps sized for 3.5mm ID lines and automotive vacuum nipples.
• Inspect fittings after road testing to confirm no slippage.

Who is this for? This Boost Monkey 3.5mm silicone vacuum hose is aimed at BMW owners, mechanics, tuners, and DIY enthusiasts who need a dependable, OEM-compatible replacement for part #117312599965 or who want a durable hose for vacuum, boost controller, or EVAP plumbing. It suits anyone who values long-lasting material performance, precise sizing, and enough length to complete multiple repairs or a single extensive run.