What size valve is used?
The standard valve has a 4" opening, perfect for California weather. In higher precipitation climates, e.g. Portland, OR, or for very large drainage areas, a 6" or even 8" valve is an option. Valves sizes can be specified up to 12".
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The Safe Drain® is a patented product (Patent Numbers: 5,383,745; 5,582,720; 5,728,294) and is protected by other patents and patents pending.
