RAPIDAIR FASTPIPE F28075 3/4-Inch Fastpipe Master Kit, 100-Feet Aluminum pipe with Nylon compression fittings 100 ft of 3/4 pipe (12) 8 ft. 6 in. pieces (7) Unions, (5) Elbows, (2) Tees, (20) Clips, Tools, (3) Outlets, (1) Threaded adapter x 3/4 Male NPT 190 psi Working Pressure Outside diameter 20mm (0.79 inches); Inside diameter 17.5mm (0.69 inches)