Can I use this for a dryer outlet?

maybe, but it might be to shallow.

How does one attach receptacles to this? There's no center screws.

This box is designed to hold 2 receptacles. You can get a narrower deep box for one. Some outlets may require a box this size but will have holes (for screws) spaced to match those in this box.

shippment missing 1 Gang 4, what can be done to get another one?

Try contacting the shipper or the manufacturer.

is there an electrical box cover that fits this?

The four tabs (2 each on top and bottom) fit 2 devices side-by-side: two duplex outlets, two switches, two Decora (e.g.,GFCI), etc., or a combination. Then you cover it with a plate of the type that you'd use as a wall cover. The plate screws fasten the plate to the switches. It does not fit a mud ring or steel device plate, both of which require a box with screws on opposite corners. You need a ground screw for the box and as well as a cable fastener, either plastic or metal, to hold the cable as it enters the box. It's not always easy to sort this out, even when staring at the Home Depot/ Lowes device box and cover aisles. Maybe the big-box stores are worse, now that I think about it. See Hubbell Wiring 192 4" Eight 1/2" and Four 3/4" Knockouts 1-1/2" Deep Square Box. This is shallower than your 2 1/8 but it is a drawn box (rounded corners) with the two screws on opposite corners.

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RACO 680 2-Device, 2-1/8-Inch Deep, 1/2-Inch Side Knockouts 4-Inch Square Switch Box, Drawn

RACO 680 2-Device, 2-1/8-Inch Deep, 1/2-Inch Side Knockouts 4-Inch Square Switch Box, Drawn

Product ID: 78691368

Details

Brand
RACO
Color
Gray
Material
Alloy Steel
Product Dimensions
2.2"D x 4"W x
Style
Compact

📏4 in. square size

🔧17 side knockouts

⚙️30.3 cu. in. capacity

5.32 OMR

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Description

⚡ Power up your installs with the RACO 680 — where efficiency meets durability!

SPACIOUS DEPTH - 2-1/8 inch deep design offers ample room for modern wiring demands.
DUAL DEVICE READY - Accommodates two wiring devices seamlessly, cutting installation time in half.
DURABLE DRAWN STEEL - Pre-galvanized alloy steel ensures long-lasting, corrosion-resistant performance.
VERSATILE KNOCKOUTS - Seventeen 1/2-inch side knockouts provide flexible conduit entry options for any setup.
SURFACE MOUNT FRIENDLY - Ideal for exposed work with a sleek drawn construction that fits surface-mounted wiring.

The RACO 680 is a 4-inch square, 2-1/8-inch deep drawn steel switch box designed for dual-device installations. Featuring a spacious 30.3 cubic inch capacity and 17 half-inch side knockouts, it’s engineered for surface-mounted wiring applications, offering durability and flexibility for professional-grade electrical setups.

Specifications

ASIN	B000BQRWP4
Best Sellers Rank	#30,558 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #74 in Electrical Boxes
Brand Name	RACO
Capacity	30.3 cubic inches
Color	Gray
Customer Reviews	4.7 4.7 out of 5 stars (305)
Finish Type	Painted
Global Trade Identification Number	00050169006801, 50050169006806
Included Components	electric-motor-controls
Installation Type	Wall Mounted
Item Dimensions D x W x H	2.2"D x 4"W x 4"H
Item Type Name	Switch Box
Item Weight	0.8 Pounds
Manufacturer	Hubbell Electrical Products
Material	Alloy Steel
Model Number	680
Part Number	680
Specification Met	Ul
Style	Compact
UPC	767674825390 050169006801
Unit Count	1.0 Count
Warranty Description	1 Year Warranty

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TrustScore 4.5 | 7,300+ reviews

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5.32 OMR

Duties & taxes included

In stock

Sold byAmazon OMANDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to OMAN.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Excellent communication throughout the order process. Product is perfect.

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