into notch 5 to secure the position of closing panel 9 as shown in fig3 and then to be removed from notch 5 to allow closing panel 9 to be removed from the pet door 4 interior pocket 19 is preferably wider than mount 12 and a biasing member 13 is preferably provided with mount 12 to hold the position of slide 8 in place this helps prevent slide 8 from being accidentally inserted into or removed from notch 5 by such things as vibrations caused by the sliding door biasing member 13 may be eliminated in favor of a wider mount 12 with more frictional contact with pocket 19 but this is not preferred since even small amounts of dirt or other debris could easily interfere with smooth operation of the latch fig4 is an exploded view of an embodiment of the invention showing illustrating a closing panel 9 with notch 5 a slide 8 with attachment bolts 11 mount 12 and a rubber cord biasing member 13 and openings 18 in frame 7 for receiving bolts 11 referring to the exemplary embodiment of the latch assembly of fig5 it is seen that mount 12 is made of anodized aluminum although any suitable rigid material such as metal or plastic may be used in this example a rubber cord 13 cut to a specific length is inserted onto a cross drilled hole to act as a compression spring the latch slide 8 is thereby machined so that the slot 19 has clearance on.