Correct service access
Match the Torx key to the lock.
Two-inch Guardian Flat and Dome locks use T40. Three- and four-inch locks—plus round and square floor drain models—use T45.
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Before you order
A precise fit starts with a precise measurement.
Drain size labels and actual openings are not always the same. Review the guide and contact us if you are unsure.
More locking solutions
Have a floor drain that isn’t compatible with Guardian?
Drain-Net offers an alternative locking solution. We retrofit OEM floor-drain covers with the Lock & Stop Drain Lock, providing tamper-resistant protection for drain sizes and configurations outside the Guardian product range.
Explore Lock & Stop Drain Locks →