You can easily keep water and debris from getting inside your flagpole sleeve by using the Service First flagpole boot. Designed to fit Service First Flagpoles. The boot is easily concealed with a Service First Flash collar!
20' Sectional will require the 2" Boot (small).
All Telescoping poles and the 25' & 30' sectional Flagpoles will require the (Large) Boot.
How to use the Flagpole Boot:
Flagpole installation video: