Is the rock hollow from the inside? I'm trying to cover a sprinkler when not in use.

Yes, it is hollow. I used mine to cover the water clean outs that are in my front yard..... I am sure it will work to cover a sprinkler.

I have an electrical box to cover. It is 12" high and about 8" wide. Can anyone provide me with the interior dimensions?

15" high from top to base. The base is 18" wide on the narrow side and 23" wide on the longer side (the base is an oval not a circle).

The measurements listed on your amazon site for this x-large faux rock are very confusing. Can you give me a more straightforward measurement?

ok ... its odd shaped like a natural rock ... we covered a square electric box 14"Height, 13"front to back, 15"left to right. at its base the rocks opening is 24" wide but it is triangular in shape, so narrows as it gets taller. Also 18" at its highest point inside center ... hope this doesn't confuse you more :)

ASIN	B00NOP1MV4
Brand	Outdoor Essentials
Brand Name	Outdoor Essentials
Colour	Gray
Country of Origin	USA
Customer Reviews	4.7 out of 5 stars 1,977 Reviews
Global Trade Identification Number	00090489314798
Grade Rating	Residential
Item Diameter	10.5 Inches
Item Dimensions	43.2 x 26.7 x 20.3 Centimeters
Item Form	Outdoor Faux Rock Cover
Item Shape	Irregular
Item Thickness	8 Inches
Item Weight	1.81 kg
Item dimensions L x W x H	43.2 x 26.7 x 20.3 Centimeters
Manufacturer	Universal Forest Products
Material	Fiberglass composite
Material Type	Fiberglass composite
Model Number	204922
Number of Items	1
Part Number	204922
Shape	Irregular
UPC	090489253189 090489314798

Outdoor Essentials Faux Rock, Tan, Small

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