Orbit 53211 Sprinkler System 10-Inch Circular Valve Box
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Questions & Answers
Unless I know more details, such as where you are located and how cold the weather is in your area, it's hard to answer that question. No insulation is provided on the valve boxes, they are just thin plastic. I would say no if you ask if they will prevent frost or freeze damage to a sprinkler or valve on their own.
Amazon has none that I can locate. Could you please let me know if you found
use fake rock or something similar to cover the hole - but you may get better results with actual rock. In case it is buried, it is hard to relocate
This type of valve box lid is typical of those secured with lag screws. The screws are inserted into the recessed part of the lid, and the screws are fastened Locked would be a wrong term secured would be a better word to use. In addition to preventing accidental or unauthorized lid removal, the screw also prevents accidental or unauthorized opening.