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Defender Security U 9809 Sliding Window Lock for Vinyl Windows

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Easy installation to keep windows securely closed - White Diecast Construction (Pack of 2) Defender Security U 9809 Sliding Window Lock for Vinyl Windows.

EACH PACK INCLUDES – (2)Adjustable jaw that fits all vinyl frame rail thicknesses from 1/16" up to 1/2" thick. "Vise like" grip holds securely and will not mar frame. Allows window to lock in ventilating position; cam style locking lever; no tools required. This is for Vinyl Windows only.

SECURELY LOCK WINDOWS – These sliding window locks for vinyl windows help keep them securely closed. The locks feature an adjustable jaw that has a “vise-like” grip, and they are capable of opening up to ½” wide.

ADD EXTRA SECURITY – Use these sliding window locks to prevent unwanted intruders and avoid falling accidents –keeping your windows closed when you want them the most secure! Air and a breeze can get in, but no intruders.

 FOR USE ON MOST VINYL WINDOWS – These sliding window locks are for use on horizontal sliding windows and most vertical sliding (single hung) windows as a secondary window lock.

 PRODUCT INFO – These sliding window locks have a diecast construction with a white painted finish and can fit most vinyl frame rail thicknesses ranging from 1/16” to ½”.


We provide free UPS ground shipping anywhere in the continental United States and $34.99 for Hawaii Alaska and Canada. Our turnaround time is approximately 3 to 5 days.

Customer Reviews

Based on 4 reviews
Ruby Voss
Chainsaw is spoiled!

Our cat, Chainsaw, is very active. She loved being outdoors (in her Catio) but was very demanding so we decided to buy her a cat door. She learned how to use it almost immediately and now can roam in and out as she pleases.

Barbara B.

These installed so easily and are so secure that I have no ill feelings about not being able to use my window locks now that my cap flap door is installed. And let me say this about the door: LOVE IT! My window leads out to a screen porch and now my 9 month old cat can go out there all he wants, and he's out there a lot. He's the happiest cat ever! Before I used to have to prop the porch door open for him, or keep it shut if the temps outside were unfavorable. No more!!! It's a win/win for us!

Chrissy Hotz
Excellent product

Wonderful product and great customer service. Thank you!

Alicia Nguyen

Replaced a cheaper, expandable cat door from Amazon with this. This cat door looks 100x better and fits better in the window without drafts. We've had a couple of windy days and I haven't heard the flap going back and forth. Worth the extra money to get a custom fit door!