If you are more serious about ensuring proper drainage then lowering the drain is another option.
Roof drain strainer.
Replaces popular 10 inch plastic strainers domes.
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These buckets are designed to help prevent debris and sediment from going down the drain and.
If appropriately designed a strainer or leaf filter is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged preventing any water flow.
9 1 2 od base x 4 1 4 high with 3 bolt mounting holes.
Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.
Most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged preventing any water flow.
The hidden baskets are detachable for easy cleaning.
Easy to install in a variety of shower drains these strainers are designed to catch hair and other debris helping drain pipes remain free of clogs.
If appropriately designed a strainer is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow.
This is by far is the best way to make sure that your drains are doing the job they are meant.
Shipping leadtime 1 3 business days.
This video explains the principle of a drain basin.