3" X 3" Post Adaptor for Imperial Aluminum Solar Post Cap from Classy Caps - Choose Your Color

Product Description

3" × 3" Adapter — Fits Imperial Aluminum Solar Post Caps

• Expand fit — Adapts the Imperial Aluminum Solar Post Cap to true 3" × 3" posts.
• Factory look — Snug, centered fit—no shims or improvising.
• Durable match — Cast-aluminum construction aligns with the Imperial family finish.
• Fast retrofit — Seats in the cap base; tool-light install.

Standardize on Imperial caps across your rail system—even where you encounter 3" posts. This adapter nests inside the cap’s base to enlarge the opening, preserving a tight, rattle-free fit and a seamless finished look. Working a mixed-size layout with larger feature columns nearby? Keep the metal aesthetic cohesive by using a 6"-class aluminum cap such as Oxford for big square posts.

Specifications

Installation (Quick Steps)

• Verify post is true 3" × 3" and cap is an Imperial aluminum model.
• Insert adapter into cap base until fully seated.
• Mount cap/adapter assembly; confirm centered, snug fit.
• Finish — Tighten fasteners; check alignment.

Buying Guide

• SKU consolidation — Run one aluminum cap line across multiple post sizes.
• Seamless finish — Material/finish alignment keeps the look consistent.
• Use cases — Aluminum/steel railing systems with true 3" square posts.

Frequently Asked Questions

Does this work with PVC or wood caps?

No—this adapter is for the **Imperial aluminum** cap family. Use PVC-specific adapters for vinyl/wood posts.

What sizes do Imperial caps fit without an adapter?

Typically 2.5", 2.25", and 2" posts; the 3" post uses this adapter.

Is the adapter metal?

Yes—cast aluminum for strength and a factory-matched look.

Comparison

• 3" Adapter (this item) — Converts Imperial aluminum caps to true 3" posts.
• Imperial Aluminum Cap — Modern, low-profile cap for 2.0"/2.25"/2.5" posts (native fit).
• 6"-Class Aluminum Caps — Use on large feature columns to keep a cohesive metal palette.