A window stopper is a simple device that limits or secures how far a window can move. On Walmart.com, you’ll see a few common types:

• Sliding window locks: Clamp-on or keyed pieces that fit in the track to hold a sash at a set height or keep it shut.
• Security bars: Adjustable bars that brace between the frame and sash for a fixed opening or closed position.
• Restrictors/vent stops: Small stops that limit travel for controlled ventilation.
• Draft stoppers/weatherstripping: Not for movement control, but help seal gaps against air.

Match the stopper to your window type (vertical or horizontal), measure your track, and consider no-drill options. Avoid blocking emergency exits and follow any building rules or lease requirements.

Sealing drafts can make a room feel more comfortable. Options on Walmart.com include:

• Foam weatherstripping: Self-adhesive strips that compress to close gaps around the frame.
• Draft stoppers: Door/window gap fillers that sit along the sill to reduce airflow.
• Weather sealing tape: Transparent tape that helps close small seams and cracks.

For best results: clean and dry the surface, measure gap sizes to choose the right thickness, and apply evenly without stretching. Test adhesives on a small area first and remove slowly when needed. These steps can help reduce drafts, but effectiveness varies by window condition. Be mindful not to block required ventilation or emergency egress.

To limit travel, consider a window restrictor or vent stop that sets a fixed opening, or a sliding window lock that clamps onto the track at your preferred position. Adjustable security bars also let you prop a sash to a specific gap.

1. Measure where you want the opening to stop.
2. Choose a no-drill clamp, adhesive stop, or bar compatible with your window track.
3. Install per instructions and test for smooth operation.

Many options are designed for both vertical and horizontal sliders. Always keep emergency exits accessible and check local guidelines. Quick-release features can offer convenient ventilation while maintaining safety.

If a sash won’t stay up, a sliding track lock or keyed window stopper can hold it at the height you choose. Another temporary option is an adjustable security bar or tension-style rod placed between the sash and sill to brace it in position.

• Verify the lock fits your track thickness (metal, vinyl, or wood frames vary).
• Set the stop at the desired height and tighten gently—avoid overtightening.
• Test by opening and closing a few times to confirm hold.

If the window repeatedly slips, the internal balances may be worn and could need service. Any add-on device should be used carefully and removed before closing the sash fully.

Start by measuring the span the bar needs to cover:

• For vertical windows: Measure from the top of the lower sash to the sill (or desired opening).
• For horizontal sliders: Measure the inside distance between the frame and moving panel.

Pick an adjustable range that comfortably includes your measurement, and look for rubber end caps to improve grip and protect surfaces. Decide between no-drill placement or brackets, and consider quick-release styles if you need regular ventilation. Product pages usually list minimum and maximum lengths and compatible window types. You can filter by size and style on Walmart.com, then choose the pickup or delivery option that suits you.