Hollow End Line Taps Problem: A/C and hydraulic line fitting threads become corroded over time and are damaged in disconnect process requiring complete line removal to repair. Solution: Hollow end line taps rethread female fittings without line removal. Hollow end of tap slides over flared end of line easily, rethreading female connector. Use on A/C – Heavy Duty Brake - Oil - Trans - and heater lines and coils 8 Piece kits covers all popular sizes: 14mm, 16mm, 18mm, 20mm, 24mm, 22mm, 27mm, 1 1/8” LT991