GIR 1 - THE TERMS OF HEADING 7307: TUBE OR PIPE FITTINGS (FOR EXAMPLE COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL. GIR 6 - THE TERMS OF SUBHEADING 730723: OTHER, OF STAINLESS STEEL: BUTT WELDING FITTINGS: ELBOWS, BENDS: OTHER THAN FOR USE WITH CERTAIN TYPES OF AIRCRAFT.