Any number of these 50mm sections may be added to flaps Ref:

• CAT MATE 360W Microchip & Disc CAT FLAP - WHITE

• CAT MATE 360B Microchip & Disc CAT FLAP - BROWN

• Closer Pets CP360G Microchip & Disc CAT FLAP - GREY

• CAT MATE 355W Super Selective Microchip & Disc CAT FLAP - WHITE

• CAT MATE 356W Selective Microchip & Disc CAT FLAP - WHITE

• CAT MATE 306W ELITE SELECTIVE CAT FLAP - BROWN

• CAT MATE 306B ELITE SELECTIVE CAT FLAP - BROWN

• CAT MATE 305W ELITE SUPER SELECTIVE CAT FLAP - WHITE

• CAT MATE 305B ELITE SUPER SELECTIVE CAT FLAP - BROWN

• CAT MATE 358W ROTARY 4 WAY LOCKING CAT FLAP - WHITE

• Closer Pets CP358G ROTARY 4 WAY LOCKING CAT FLAP - GREY

• Closer Pets CP358B ROTARY 4 WAY LOCKING CAT FLAP - BROWN

• Closer Pets CP358BK ROTARY 4 WAY LOCKING CAT FLAP - BLACK

• CAT MATE 359W Timer Control Cat Flap - WHITE

   Wall Thickness = Liners Required

    21mm - 99mm = 1 Tunnel

 100mm - 149mm = 2 Tunnels

 150mm - 199mm = 3 Tunnels

 200mm - 249mm = 4 Tunnels

 250mm - 299mm = 5 Tunnels

Some cutting may be required!