The Aeroquip Radiator/Cooling Refill Coupling allows quick refill and draining of the cooling system reducing the possibility of lost fluid.Two fitting types are available, either male or female (designed to be used together) with the female fitting available in either aluminium or steel. The couplings contain viton seals which ensure higher temperatures can be contained, with a range of -26 to 150 degrees Celsius and an operating pressure of 250psi. The aluminium couplings offer significant weight reduction over steel items however the internals maintain optimum quality and corrosion resistance being constructed from stainless steel.The couplings each feature 1/2" NPTF threads for attachment to a huge range of hose/component fittings and are supplied in red and blue for ease of differentiation.