Product Description
5" × 5" White PVC Post Adapter — Fits SLO74W, SLO78W & SL4400 Classy Caps
- Upsize with confidence — Enlarges a 4" cap base to fit actual 5" × 5" vinyl posts.
- Cap compatibility — Built for SLO74W (Original), SLO78W (Regal) and SL4400 (Windsor).
- Factory look — Inserts in the cap base for a centered, tight fit and a clean finished profile.
- UV-stable PVC — White material blends seamlessly with white vinyl railing/fencing.
- Retrofit friendly — Ideal when new 5" posts are added to spaces with existing 4" cap inventory.
This 5" white adapter lets you standardize on Classy Caps’ popular 4" models and still finish 5" vinyl posts flawlessly. It snaps inside the cap base to expand the opening, ensuring the cap sits square and secure without makeshift fillers. That means fewer SKUs to manage and a consistent look from one area to the next. If your project mixes 6" feature columns, keep the premium aesthetic aligned with the Cambridge 6" × 6" Solar Post Cap. For 4" metal/vinyl runs that need a tougher body, consider the cast-aluminum Imperial Solar Post Cap.
Specifications
| Function | Enlarges 4" cap opening to fit 5" × 5" posts |
| Compatible Caps | SLO74W, SLO78W, SL4400 |
| Material / Color | UV-stable PVC / White |
| Install | Seats inside cap base; fast, tool-light installation |
Installation (Quick Steps)
- Confirm — Verify cap model (SLO74W/SLO78W/SL4400) and actual 5" post.
- Insert — Seat adapter fully inside the cap base.
- Mount — Fasten cap/adapter assembly to post.
- Check — Ensure tight, centered seating.
Buying Guide
- SKU consolidation — Use your go-to 4" caps on 5" vinyl posts without stocking separate 5" caps.
- Finish match — White adapter complements white PVC systems.
- Exact fit — Designed specifically for SLO74W/SLO78W/SL4400 bases.
Frequently Asked Questions
- Will this work with other Classy Caps models?
- It’s made for SLO74W, SLO78W, and SL4400. Check your cap’s documentation for compatibility.
- Does the adapter add visible bulk?
- No — it nests inside the cap base, preserving the cap’s low-profile silhouette.
- PVC color/UV stability?
- It’s white UV-stable PVC engineered for outdoor exposure.
Comparison
- 5" White Adapter (this product) — Upsizes 4" caps to 5" vinyl posts (SLO74W/SLO78W/SL4400).
- 3.5" Tan Adapter — Sizes 4" caps down to 3.5" wood posts (SLO74W/SLO78W).
- Native-fit caps — Choose a cap natively sized to 5" when you prefer a single-piece solution.
