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Single-gang galvanized zinc mud ring with tapped ears and raised center

Hubbell Incorporated

Hubbell Incorporated RACO 773 Mud Ring, 1 Gang, Galvanized Zinc, Electrical Box

SKU CH-M3HJ-XQGRZ

Single-gang plaster ring adds 5.50 cubic inches capacity with galvanized zinc construction and 3/4 inch raised depth

  • TypeElectrical Boxes & Covers
  • Single-gang plaster ring adds 5.50 cubic inches capacity
  • Galvanized zinc construction resists corrosion in damp locations
  • Raised 3/4 inch depth accommodates thick wall finishes
  • Tapped ears provide secure device mounting points
  • Center blanked design allows flexible conduit entry options

Single-gang mud ring for plaster finishes

The RACO 773 is a single-gang plaster ring made from galvanised zinc. It adds a 3/4 inch raise to a square electrical box and provides a keyed surface for plaster adhesion. The ring includes tapped ears for secure mounting and a centre-blanked design. It suits electricians and builders finishing interior walls where a flush device opening is required.

Upgrading from a flat cover or shallow ring

When an existing box sits too deep for the planned plaster thickness, this ring bridges the gap without replacing the box. The 3/4 inch raise aligns the device opening with the finished wall surface. The jump is worth it whenever the plaster coat exceeds the depth of a standard cover and a deeper plaster key is needed for a clean, code-compliant finish.

5.50 cubic inch capacity for device wiring

The ring encloses 5.50 cubic inches of wiring space, giving room for a switch or receptacle and its conductors. It comfortably handles standard residential devices with typical pigtails. Headroom runs out when multiple large connectors or bulky smart devices are added, at which point a deeper box or extension ring becomes necessary.

Highlights

  • Single-gang plaster ring adds 5.50 cubic inches capacity
  • Galvanized zinc construction resists corrosion in damp locations
  • Raised 3/4 inch depth accommodates thick wall finishes
  • Tapped ears provide secure device mounting points
  • Center blanked design allows flexible conduit entry options

Specifications

BrandRACO
TypeElectrical Boxes & Covers

Questions about this item

What size square box does the 773 mud ring fit?

The 773 mud ring mounts on a standard 4-inch square box with its tapped ears.

How do I install the 773 mud ring and what step is often missed?

Fasten the mud ring to the square box using the tapped ears, then ensure the center blank is removed before pulling wires.

When should the 773 mud ring be replaced?

Replace the mud ring if the galvanized zinc coating shows corrosion or the plaster key tabs are damaged during renovation.

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