Dock Post Cap - For 1-1/4", 1-1/2", or 2" I.D. pipe.
SPECIAL INSTRUCTIONS Pipe is measured on the INSIDE, whereas tubing is measures on the OUTSIDE. (A TUBE example is a chain-link fence post.) Since our dock posts, as well as most other manufacturers dock posts, are steel pipe, the size is measures on the INSIDE.
Measure the INSIDE of the pipe and order that size. DO NOT measure the OUTSIDE of the pipe.