A 4”  Neptune post cap is installed on every 4” x 4” vinyl fence post

it is actually one of the most essential components in the building of a chain link fence

Superior rust resistance

helps prevent damage caused by long-term exposure to rainwater

or if you want extra support

3" End Post "RH" Adapter 8' A 4” Neptune post capSuccessfully constructing a wood fence with steel end posts includes securing the posts to the wooden railings. Doing so enhances your fence's structural support and extends its overall life. This end post adapter has been designed and fabricated to accommodate 3" metal posts, featuring a hooked edge to grip onto a horizontal rail, with numerous screw holes for attachment. The looped piece through which the post's inserted likewise features a screwed