Manufactured using aluminum alloys that meet or exceed minimum requirements for aerospace hose fittings. CNC manufactured, durable, tight, secure and leak free connection. Each component is precision-machined to exact tolerances for trouble-free performance. For flaring aluminium weld on adapter, as your fuel cell, oil cooler, catch tank, swirl pot or any other aluminium tank etc. The diameter of the base is 2.5cm(0.98'').