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

Raco Hubbell 680 2-Device, 2-1/8-Inch Deep, 1/2-Inch Side Knockouts 4-Inch Square Switch Box, Drawn, Silver,Gray

Product ID: 291352881

Details

Brand
RACO
Colour
Gray
Material
Alloy Steel
Product dimensions
5.6D x 10.2W x
Style
Compact

📏30.3 cu. in. capacity

🔧17 half-inch knockouts

🛡️2-hour fire rated wall use

₨15360

Duties & taxes included

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your space with precision and protection!

VERSATILE KNOCKOUT DESIGN - Seventeen 1/2-inch knockouts for flexible wiring options
FIRE RATED SAFETY ASSURANCE - Certified for 2-hour fire rated walls for peace of mind
DURABLE PRE GALVANIZED STEEL - Long-lasting drawn construction resists corrosion
COMPACT SURFACE MOUNT READY - Ideal for sleek, professional installations
SPACIOUS 30 3 CU IN CAPACITY - Fits multiple devices with room to spare

The Raco Hubbell 680 is a 4-inch square, 2-1/8-inch deep switch box crafted from durable pre-galvanized steel. It offers a generous 30.3 cubic inch capacity, 17 half-inch knockouts for versatile wiring, and is UL certified for use in 2-hour fire rated walls. Designed for surface mounting, this compact, gray switch box combines safety, durability, and flexibility for professional electrical installations.

Specifications

ASIN	B000BQRWP4
Brand Name	RACO
Capacity	30.3 cubic inches
Color	Gray
Customer Reviews	4.7 4.7 out of 5 stars (335)
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	5.6D x 10.2W x 10.2H centimeters
Item Type Name	Switch Box
Item Weight	363 g
Manufacturer	Hubbell
Material	Alloy Steel
Model Number	680
Number of Items	1
Part Number	680
Specification Met	UL
Style	Compact
UPC	767674825390 050169006801
Unit Count	1 Count

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