These cat flaps are self-framing only to a maximum of 1/2" which effectively means they should not be used for hollow core doors. (Note: any door that is not solid wood should be considered "hollow core").

However, they certainly may be installed in any solid core wood door and, also, in thin materials no thicker than 1/2". A thin wood panel door or screen are two good examples.

In addition, the Cat Mate 303 Wall Liners may be used to allow installation of both of these cat flaps in a wall. Just use as many of these 2" sections as required for the thickness of the wall. They're found at "Parts & Flaps".

Cat Mate 304 Cat Flap with
2-Way Lock

Cat Mate 309 Cat Flap with
4-Way Lock

Selection Table for the Cat Mate 304 & 309 Cat Flaps

Size & Model Number	Flap Dimension	Rough Cut-Out	Outside Frame Dimension	Price	Buy
304 Two-Way Locking 03AM304	5 3/4" x 6 1/4"	6 1/2" x 6 7/8"	7 5/8" x 7 7/8"	$1149
309 Four-Way Locking 03AM309				$1389
Frame Color Options: W-White B-Brown G-Grey			Frame color options are presented after you "Buy Now"
Warranty Installation Installation Options			Parts & Flaps

CAT MATE       DOG MATE