Earl's uses aluminum alloys which meet or exceed minimum required for aerospace hose end specifications. the original Swivel Seal stainless retention pins allow 360 degree adjustment after installation. Nobody exceeds the fluid flow capacity that Earl's bent tube hose ends offer. Each hose end component is precision machined to exacting tolerances for trouble-free performance in the field. The nipple and cutter design has been aerospace proven for over forty-five years, and in competition by Earl's for over twenty-five years. Earl's nipple and cutter primary seal system stands unsurpassed in its sealing integrity.