Our 1" tube is used for large feeding / mainlines for rows or to get water to a more distant area without loosing to much pressure due to friction loss. The tube is a 1.06 I.D. and a 1.20 O.D. Max single line length is 960 ft.
All of our fittings listed as 1" will work with this 1" poly tube.
I.D. and O.D. = Inside Diameter / Outside Diameter