Rear window screen pass through-pet door
When replacing the rear bath window screen, I added a pass through/pet door. We use it to pass the shower wand out to use as an outdoor shower (reach in to use controls). We can also reach the sink faucet to help flush out the stinky slinky (no grey tank). At the beach, I pass the wet suits out the screen to hang up to dry. Works as a cat door too!
It is two plastic frames that snap together, cut the screen, and all done! Does not interfere with window locks! Window screen is solar screen to reduce sun and for privacy. Due to the thickness of the screen, I did have to cut the holes in the screen for the small posts that snap together the frames. ~30 minute install
Ideal Pet Products 7.25-by-14.5-Inch Pet Passage Screen Door available at Amazon.com ~$22