For ChubbyKat/HeftyKat/Med.Pet Flap/Solid LEXAN™ Plastic Flap/Plastic Frame/Chrome Steel/4-Way Lock - 3 Pcs.
Chubby Kat/Hefty Kat - Miscellaneous Parts - Red Plastic Lock
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To determine the correct size door simply measure the width (A) and height (B) of your pet.
(A) Measure the widest point of your pets shoulder
(B) Measure from the top of your pets back (just behind his head) to the bottom of chest.
FLAP SIZE DETERMINES ALL REPLACEMENT PART AND PET DOOR SIZES: 5"x 9-1/4"(S), 7-1/4"x13"(M), 9-3/4"x17"(L/XL), 15"x23-1/2"(XLG/SL)