Septic-Direct’s 30″ x 36″ Fiberglass D-Plate Adapter allows a new way to connect any riser system (i.e. Tuf-Tite, Polylok, etc.) to a new or existing concrete D-Box.
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Made from durable composite fiberglass, the D-Plate is designed to withstand deflection caused by heavy soil loads. The strength of the 1/4″ fiberglass D-Plate allows for the marriage of the larger diameter poly riser over top of the smaller opening of the square concrete d-box.
The D-Plate can also be used as an adapter for any riser system over a septic tank opening. The D-Plate’s large 36″ x 30″ footprint provides coverage and security over any large septic tank opening that you are trying to gain access to with poly risers.
To install, apply sealant (i.e. Conseal Mastic, I/I sealant, Orenco ADH200, etc.) around the rim of the exposed concrete D-Box. Fasten the D-Plate to the D-Box with concrete fastening screws (i.e. TapCons). Fasten appropriate Adapter ring over the opening of the D-Plate with 5/16″ x 1″ self-tap screws and sealant. Adapter Ring Models are listed below. Use desired Risers and Lid to extend to grade.
Adapter Rings, Risers & Lid Models compatible with the D-Plate: pdf
Manufacturer Size Adapter Ring
Tuf-Tite 20″ 20-RTT
Tuf-tite 24″ 24-RTT
Polylok 20″ 3009-RTR20
Polylok 24″ 3009-RTR24
Polylok 24″ 3009-AR-C
Orenco 24″ RRFTA24
EZSet 24″ Adapter Flange
Sim/Tech 24″ STF-AR24