Diameters are as follows: Larger end - Inner Diameter 2.75" OD 3.25" Smaller end - Inner Diameter 1.75" OD 2.25" roduct features: · Thickness: 2mm to 5mm, 3-4-ply · Working Temperature: -76°F (-60°C ) to +500°F (+260°C) · Working Pressure: 0.3 to 0.9MPa · Bursting Pressure: 2MPa · Size Tolerance: +/-0.5mm · 1 Year Warranty · Color available : Black / Blue / Red · Made from high quality woven thermoplastic and pure silicone materials to form the highest quality engine hoses and offer longer life expectancy · Handmade and carefully inspected · High performance and reliability in high pressures conditions · Flexible and can handle extreme temperature from -60°C to +260°C or -76°F to + 500°F · Resistant to UV, water, ozone and oxygen · Not suitable for fuel or oil transfer · Manufactured under ISO 9001 quality system