Product Description
3.5" × 3.5" Tan Post Adapter — Fits SLO74W & SLO78W Classy Caps
- Size-down solution — Reduces a 4" cap base to fit actual 3.5" × 3.5" wood posts (nominal 4x4).
- Model-specific fit — Designed for Classy Caps SLO74W (Original) and SLO78W (Regal) solar post caps.
- Clean install — Nests inside the cap base for a centered, rattle-free fit and a factory look.
- Durable material — UV-stable PVC in Tan to coordinate with warm fence/rail colors.
- Retrofit friendly — Ideal when your project mixes vinyl 4" posts and wood 3.5" posts.
Use this tan 3.5" adapter when you want the proven look of Classy Caps’ 4" solar caps on standard wood 4x4s (actual 3.5"). It drops into the cap base to reduce the opening, centers the cap on the post, and tightens the fit so the assembly feels purpose-built—no wobble, no shims. Because it’s model-specific, you get predictable results on the popular SLO74W and SLO78W caps that many installers keep in stock. Planning a job that also uses premium 6" feature posts? Keep the design language aligned with the aluminum Cambridge 6" × 6" Solar Post Cap. For 4" square metal or vinyl runs, consider the durable cast-aluminum Imperial Solar Post Cap to balance aesthetics and longevity.
Specifications
| Function | Reduces 4" cap opening to fit 3.5" × 3.5" wood posts |
| Compatible Caps | SLO74W (Original 4×4 PVC) & SLO78W (Regal 4×4 PVC) |
| Material / Color | UV-stable PVC / Tan |
| Install | Seats inside cap base; tool-light installation |
Installation (Quick Steps)
- Verify — Confirm cap model (SLO74W/SLO78W) and actual 3.5" post size.
- Insert — Place adapter inside the cap base until fully seated.
- Mount — Fasten the cap/adapter assembly to the wood post.
- Check — Ensure the cap is centered and snug.
Buying Guide
- Inventory simplifier — Run one 4" cap SKU across vinyl and wood sections by adding this adapter on wood.
- Color match — Tan blends with earth-tone rails and trims.
- Model-specific — For SLO74W/SLO78W; use the 5" adapter if you need to upsize to 5" vinyl posts.
Frequently Asked Questions
- Will this work with other 4" Classy Caps models?
- It’s designed for SLO74W and SLO78W. Check documentation for other cap-specific adapters.
- Does it change the cap’s height or appearance?
- No — it nests inside the base; the installed look remains clean and low-profile.
- Is it paintable?
- It’s tan PVC; most customers use it as-is to match tan caps/rails.
Comparison
- 3.5" Tan Adapter (this product) — Sizes 4" caps down to 3.5" wood posts.
- 5" White Adapter — Upsizes select 4" caps (SLO74W/SLO78W/SL4400) to 5" vinyl posts.
- No adapter — Use caps natively sized to your posts where a dedicated model exists.
