Why Use Exoracing Black Silicone Vacuum Hose?
Vacuum leaks are small faults that can create big problems: rough idle, hunting revs, odd ECU codes, unstable boost control, inconsistent gauge readings and poor engine response. Most of the time, the cause is an old rubber line that has gone hard, brittle, split or loosened from heat and age.
Exoracing black silicone vacuum hose restores a clean, airtight path for the signals your ECU, boost controller, wastegate, MAP sensor and gauges rely on. It stays flexible in the engine bay, resists ozone and UV better than standard rubber, and gives the bay a tidy black OEM-plus finish.
Use it anywhere you need a reliable vacuum or low-pressure signal line. Do not use standard silicone vacuum hose for petrol, diesel, oil or brake booster lines. If you need to route the hose near heat, use Exoracing silicone fibreglass heat sleeve, Exoracing Velcro heat sleeve or Exoracing heat reflective tape to protect the line from radiant heat.
Which Hose Size Should I Choose?
Match the hose inside diameter to the fitting or barb outside diameter. The hose should push on firmly and seal without being loose. If the barb is between sizes, choose the smaller inside diameter for a tighter fit and use a clamp where needed.
| Hose ID | Approx. OD | Typical Use |
| 4mm | ~10mm | Small vacuum, boost reference, MAP sensor or gauge signal lines where the barb matches. |
| 5mm | ~11mm | Common middle size for many engine bay signal lines and replacement vacuum hose routes. |
| 6mm | ~12mm | Larger vacuum or low-pressure signal lines where the fitting/barb needs a 6mm ID hose. |
Which Length Should I Choose?
| Length | Best For |
| 1m | Small repairs, replacing one short line, or keeping a spare hose in the toolbox. |
| 3m | Most engine bay refresh jobs involve several vacuum or signal lines being replaced. |
| 10m | Workshop use, full bay rerouting, multiple cars, or keeping stock for future maintenance. |
Purchase Includes:
- 1 x selected length of Exoracing black silicone vacuum hose
- 1 x Exoracing lifetime warranty
Features:
- Replaces old, hard, brittle or split rubber vacuum hose
- Suitable for vacuum and low-pressure signal lines
- Works for boost reference, MAP sensor, wastegate, FPR, BOV and gauge signal lines where the size matches
- Available in 4mm, 5mm and 6mm inside diameters
- Available in 1m, 3m and 10m lengths
- Flexible, kink-resistant silicone extrusion
- Black finish with white Exoracing logo for a tidy engine bay look
- Temperature range guideline: -40°C to +240°C continuous
- Includes Exoracing lifetime warranty
Exoracing Silicone Vacuum Hose Installation Guide:
- Plan the hose route before cutting, avoiding sharp edges, moving parts and high radiant heat where possible.
- Measure the old line or the route you need, then cut the silicone hose cleanly with a sharp blade or hose cutter.
- Push the hose fully onto the barb or fitting. If it is tight, warm the hose slightly to help it seat.
- Use suitable clamps, spring clips or cable ties on pressurised or vibration-prone joints.
- Start the engine and check for vacuum or boost leaks by monitoring readings or using a suitable leak-check method.
- Recheck the hose after the first drive to confirm it has not moved, kinked or softened near the heat.
Heat Protection Recommended Near Turbo Or Exhaust Areas
Silicone vacuum hose handles typical engine bay temperatures well, but local hotspots near turbochargers, downpipes, exhaust manifolds and wastegates can be much hotter than the surrounding bay. If the hose runs close to those areas, cover the nearest section with a heat sleeve and keep as much clearance as possible.
Choose a sleeve internal diameter just larger than the hose outside diameter. As a guide, the 4mm, 5mm and 6mm ID vacuum hoses are approximately 10mm, 11mm and 12mm OD.
Technical Specifications:
| Specification | Details |
| Material | High-temperature silicone (VMQ), unreinforced extrusion |
| Colour | Black with white Exoracing logo |
| Inner Diameters | 4mm, 5mm, 6mm |
| Roll Lengths | 1m, 3m, 10m |
| Nominal Wall Thickness | ~2-3mm, varies by ID |
| Approx. Outside Diameter | 4mm / 5mm / 6mm ID = ~10mm / ~11mm / ~12mm OD |
| Temperature Range Guideline | -40°C to +240°C continuous |
| Service | Vacuum / low-pressure signal lines; not compatible with fuel or oil |
| Working Pressure | 0.3MPa / 43.5PSI to 0.9MPa / 130.5PSI |
| Hardness | 70 Shore rating |
| Warranty | Exoracing lifetime warranty |
Frequently Asked Questions
What size silicone vacuum hose do I need?
Match the hose inside diameter to the outside diameter of the barb or fitting. If the barb is between sizes, choose the smaller ID for a tighter fit and use a clamp where needed.
Can I use this for boost reference lines?
Yes, this hose is suitable for low-pressure boost reference and signal lines such as wastegate, boost gauge, MAP sensor and FPR references. It is not a replacement for reinforced charge, coolant or high-pressure hoses.
Is silicone vacuum hose fuel or oil safe?
No. Standard silicone vacuum hose is not suitable for petrol, diesel or oil contact. Use the correct fuel, oil, fluorosilicone-lined or PTFE hose for those jobs.
Will the hose be supplied as one continuous length?
Lengths ordered in multiple metres are supplied as one continuous run where possible.
Can I use this for brake booster lines?
No. Brake systems are safety-critical, so use only OE-spec reinforced brake booster hose.
Notes:
- Not suitable for petrol, diesel or oil contact.
- Not suitable for brake booster lines.
- Avoid tight bends that could kink the hose.
- Use a heat sleeve near the turbo, downpipe, manifold or wastegate heat.
- Lengths ordered in multiple metres are supplied as a continuous run where possible.
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- REPLACES
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- Flexible vacuum hose for tidy engine bay routing
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- Refreshes old vacuum and boost lines
- Flexible silicone for tidy routing
- Available in common small bore sizes
Sizing: measure your existing hose ID.
Exoracing Ltd offers a lifetime warranty against manufacturing defects on this Exoracing Ltd product for peace of mind and a risk-free buying experience! We have 100% faith in our products and know they are of the highest quality, so where most manufacturers offer a year, we decided to offer a massive lifetime warranty.
Exoracing Ltd lifetime warranty will cover repairing, replacing, or store credit to the same purchase value if the part has since been discontinued, at our discretion, for any Exoracing Ltd product that is found defective.
Exoracing Ltd's lifetime warranty policy will only apply if the product was purchased through ourselves or an officially licenced distributor in our network.
This warranty policy is non-transferable and all claims under this policy must be accompanied by the original receipt of sale.