Sure Petcare SureFlap Gebrauchsanweisung Seite 11

16) To hold the end of the tunnel in position we recommend using small screws to
secure the tunnel to the external frame as shown in figure 18.
17) We recommend putting some waterproof sealant between the tunnel and the
external frame to prevent water getting into the wall cavity.
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Figure 13
Figure 15
Figure 17
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Figure 12
Figure 14
Figure 16
Figure 18