Cohline Engine Coolant Thermostat Banjo Fitting
About Cohline: German Precision in Hose & Line Systems
Founded in 1932 and headquartered in Dillenburg, Germany, Cohline GmbH has spent over nine decades mastering the engineering of pipe and hose line systems for passenger cars, commercial vehicles, and heavy machinery. What began as a focused regional manufacturer has grown into a globally recognized original equipment supplier, with production facilities in Germany, Romania, England, and the Czech Republic, as well as a trading presence in the United States.
Cohline's core philosophy is straightforward: every line and hose that leaves their facilities must meet or exceed OEM standards. Fuel lines represent one of Cohline's longest-running specialties — the company has been supplying fuel system lines to vehicle manufacturers for more than 40 years, offering both metal and plastic constructions with a variety of connection fittings designed for precise, leak-free performance. These lines serve as the critical link between a vehicle's tank and its engine, and Cohline engineers them to withstand the chemical and pressure demands of modern fuel systems.
Beyond fuel delivery, Cohline is a trusted name in hydraulic steering systems. Their power steering cylinder line hose assemblies and power steering hoses cover the full range of steering circuit needs — from suction lines and high-pressure expansion hoses to low-pressure return lines routed through oil coolers. These components are engineered to dampen pump-induced vibrations so they are not transmitted to the vehicle body, a detail that speaks to Cohline's systems-level thinking.
Cohline's vacuum hoses are equally well regarded in the aftermarket. Perhaps best known as brake booster vacuum hoses for European vehicles, these hoses are built from materials that resist heat, ozone, and aggressive underhood media — qualities that matter enormously in a component responsible for brake assist performance.
Rounding out the lineup, Cohline's brake parts portfolio includes brake lines and hoses manufactured to withstand pressures of up to 100 bar, as well as professional-grade pipe bending and flaring tools designed for precise, crack-free work on brake pipe repairs. Brake lines are double-walled, copper-coated inside and out, and finished with exterior galvanization and PVF plastic coating — a construction designed to stand up to moisture, road salt, and the full service life of the vehicle.
Cohline's OEM credentials are backed by quality certifications and an impressive roster of vehicle manufacturer partnerships. Business references include Audi, BMW, Mercedes-Benz, Mini, Porsche, and Volkswagen — names that underscore why mechanics and enthusiasts working on European vehicles trust Cohline for replacement hose and line components.
Why Choose Cohline?
- Over 90 years of engineering expertise in automotive pipe and hose systems
- OEM supplier to leading European automakers including BMW, Mercedes-Benz, Audi, and Volkswagen
- Production facilities across Germany, Romania, England, and the Czech Republic
- Products manufactured to withstand high pressures, extreme temperatures, and corrosive media
- Comprehensive range covering fuel, hydraulic, vacuum, and brake line applications