Middle Atlantic PVC BOX Adjust Plate - 881ADP

Middle Atlantic 881ADP PVC BOX Adjust Plate

Overview

The 881ADP is an adjustable PVC plate designed for use with Middle Atlantic's 881-series ratchet concrete floor boxes. It bridges the gap between the flush floor box assembly and the finished floor surface, allowing final height adjustment after concrete pour or floor covering installation — a common requirement on commercial construction sites where slab depth or tile thickness isn't locked in until the finish phase. At 4 in × 4 in × 1.13 in, the 881ADP fits within the standard 881-series footprint without adding bulk to the assembly stack.

Compatibility

Designed for the Middle Atlantic Ratchet Pro 881-series ratchet adjusting ring floor box system, including the 881 concrete floor box family available through the Middle Atlantic product line. Verify against your specific 881-series floor box model before ordering — the 881ADP is not a universal floor box adapter and is not confirmed compatible with other Middle Atlantic series or third-party floor box brands. If you are specifying a floor box solution from scratch, confirm the full 881-series assembly BOM (box body, adjusting ring, and cover plate) before procurement.

Installation Notes

TAA compliant — suitable for federal, GSA, and government-funded projects where Trade Agreements Act compliance is a procurement requirement. PVC construction keeps the plate lightweight and non-conductive. Installation integrates into the ratchet adjustment mechanism of the 881 ring; no special tooling is called out in available evidence beyond standard floor box installation practice. Confirm final finished-floor height before locking the adjustment to avoid a secondary adjustment cycle. For structured cabling and AV infrastructure projects, coordinate floor box height with the flooring contractor before concrete finishes cure. Pair with appropriate cable management accessories to maintain a clean, code-compliant floor penetration.