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Replacement Locks For Patio Doors at Lowe's Replacing a patio door lock is a simple and effective method to improve the security of your home. But, it is important to maintain the lock regularly and install the lock correctly. To replace the lock on your patio door, it is vital to know what type your current lock is. You can determine the type by looking at the screw hole size and end face plate type. Identifying Your Existing Lock It is essential to know the differences between different types of locks be