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📏 4MM ID x 8MM OD, 3M LENGTH – 4mm (5/32") internal diameter, 8mm (5/16") outside diameter and 2mm wall, supplied as one continuous 3 metre length (9.8ft, approx. 90g). Choose the ID that matches the spigot you are fitting to. 🔧 ENGINE VACUUM LINE – for cars, vans, motorbikes, boats and machinery. The 4mm bore suits MAP sensor and boost-control signal lines, wastegate actuator, dump valve and fuel-pressure-regulator vacuum references; also ideal for workshop air lines and low-pressure water transfer. 🌡️ -60°C TO +180°C RATED – continuous operating range -60°C to +180°C with peaks to +200°C. Extruded VMQ silicone to SAE J20 R3 grade stays flexible from cold starts to full engine-bay heat and will not harden, crack or perish like rubber. 🛠️ UNREINFORCED, EASY TO ROUTE – a single wall of silicone with no fabric ply, so it bends round tight routes and seals well on push-on spigots. Made for vacuum, signal, air and low-pressure water lines – not for pressurised coolant, fuel or oil; very tight bends can kink. ⚫ BLACK SILICONE – black finish that blends in with OEM pipework. Trim square with a sharp blade and secure with mini hose clips sized for the 8mm outside diameter.