The Cat Mate 303 Wall Liner in white, which adds 2 inches to Cat Mate 234 and 235 doors
box for the cat mate wall liner for cat mate 234 and 235
303 wall liner from cat mate
Cat Mate doors liner for cat door for interiror wall/exterior wall
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Cat Mate 303 Wall Liner for Cat Mate 234 & 235

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  • Each individual wall liner adds 2" to the framing range of the pet door

  • Fits Cat Mate model numbers 234 and 235 

  • Creates a waterproof tunnel between the door and the other side of the wall

  • Available in white only, but can be painted if desired

  • Makes the cut-out area appear clean and sleek

Please Note: It is crucial to measure your wall thickness prior to purchasing a CatMate wall liner. You may need to purchase multiple liners depending on your wall thickness.

The 2" Cat Mate Wall Liners for Cat Mate Doors are used to frame out the wall where you plan to install your cat door. The Cat Mate Cat Door liners create a tunnel within the interior of the wall, so it is necessary to measure the thickness of the wall prior to purchasing them. The Cat Mate doors themselves will frame out 2" right out the box. You will need to purchase Cat Mate door wall liners based on the remaining amount of wall thickness after the 2" cat door is accounted for. For example, if your wall is 8" thick, you will need to purchase three wall liners, so 6" of liner and 2" of pet door. If your wall is 7" thick, for example, you will need to purchase three wall liners and trim down accordingly for a functional fit.

Note: For installation, washers are required for the placement of the screws. Washers are not provided in this purchase.


Will I need a door liner for the CatMate 234?

No, the cat door is desinged to be installed into doors up to 2" thick.

Can I trim a catmate wall liner?

Yes you can. You should buy enough to reach withing 2 inches of your desired thickness. The pet door can be used for the final two inches.

Installation Instructions

1. Make sure that you measure the thickness of your wall and have the correct number of wall liners needed before making any rough openings in your wall.

Note: It is very important that you do not cut into any wall framing, electrical, pipes, etc., so double check when picking a location for the pet door.

2. Making the rectangular cut: Take a level and pencil to mark the lines on the wall. The bottom of the cut should be level with your pet’s stomach. Ensure that the line is straight before moving on.

Note: It is recommended that you use wood to frame out the opening, and take note that the finished framed-out opening should be 6-½” wide by 6 7/8" high.

3. Cut the interior hole out. Then remove the insulation inside.

4. Drill holes from the inside through the exterior wall and use those as pilot holes for the outside cut. Be sure to remeasure on the outside for accuracy.

Note: Tape up the inside hole with plastic sheeting or cardboard before cutting the outside wall.  This will make clean up much easier.

5. Cut out the exterior wall.

6. Assemble wall liners and fit them onto the flap frame.

Note: The manufacturer recommends pushing them together firmly, but glue can be used if you feel it would be more secure.

7. Screw the frame to the wall using the the ½” screws, putting the liners through the cutout .

8. Now drill out the four screw holes using a 3/16” in diameter drill bit.

9. Attach the exterior frame with two ¾” screws.

10. Insert the hole covers.



Additional Information

Your Maximum Pet Size


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