Zanda Safety Latches are ideal for swimming pool situations, where council regulations require a self latching gate or door. Most state regulations say something along the lines of:
Gate or door must open outward from pool
Gate or door must be self closing and self latching
Latch must be more than 1.5m from the ground
Gate or door must latch shut on the first swing
 
Diameter: 46mm
Backset: 45mm, 57mm or 70mm
 
Please note that the door will need a self closer in order to function as intended.