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

The 2" Cat Mate Wall Liners for Cat Mate Doors are used to frame out the wall where you plan to install your Cat Mate lockable cat flap. The Cat Mate wall 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 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 additional liner and 2" of pet door. If your wall is 7" thick, for example, you will need to purchase three additional wall liners and trim down accordingly for a functional fit.

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

Additional Information

Your Maximum Pet Size


Installation Instructions

Step 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.

Step 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.

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

Step 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.

Step 5: Cut out the exterior wall.

Step 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.

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

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

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

Step 10: Insert the hole covers.



Will I need a door liner for the CatMate 234 dog door?

No, the cat door is designed to be installed into doors up to 2" thick. You will only need wall liners for an in-wall installation of Cat Mate lockable cat flaps if the wall it is being installed into is more than 2" thick.

Can I trim a Cat Mate wall liner?

Yes, you can. That's what gives it an easy wall installation process. You should buy enough to reach within 2 inches of your desired thickness. The Cat Mate Cat Flap can be used for the final two inches.

Can my dog use the Cat Mate 234 and 235 4-Way Locking Cat Flap?

Small dogs may be able to fit through large cat doors, but we would recommend getting a small dog door instead.

Can I use this wall liner for my Cat Mate Elite Super Selective cat door?

No, you would need to use a different Pet Mate pet supplies wall liner.

Does the wall liner come in colors besides white?

No, but it has a paintable surface.

Where are some places I could use an in-wall pet door?

If you want to keep your cat food or litter box separate from the rest of the house, you can put them in the laundry room and install a special pet door that only your cat can use. This is especially great for multi-pet households where each cat needs their own cat litter box.

How do I order more than one wall liner?

You can either click on "add to cart" for as many liners as you need, or you can go to your shopping cart and increase the quantity (qty) before heading to checkout. If you reach the credit card information page without changing the quantity, you have gone too far.

Can I use this liner for my Cat Mate electronic microchip cat flap?

No, you would need to purchase a wall-adapter kit specifically for that door. You can also check out our full selection of pet door replacement parts and accessories for more options.


Cat Mate/ Dog Mate/ Ani Mate 3 Year Limited Warranty

Guarantees your purchase for a period of three years from the date of original purchase against any defect arising due to faulty materials or manufacture. Accordingly, any defective item will be repaired free of charge or replaced at the manufacturer’s option provided that the defect has not been caused by neglect, misuse, or normal wear and tear and proof of purchase date is supplied. Your statutory rights are not affected.

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