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MaxSeal Insulated Lockable Sash Window Insert

$536.99 - $583.99
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MaxSeal Dual Flap Sash Window Pet Door

MaxSeal Lockable Sash Window Pet Door

Dual flap Pet Door | Dual Pane Glass | Fully Lockable

Best Sealing - Best Insulating - Most Secure

The MaxSeal Sash Window Pet Door offers the very best in insulating and sealing in a window pet door. The pet door used in this unit is the MaxSeal Pet Door, Dual Flexible Flap Model that is friendly for pets to use but provides a near perfect weather barrier in the most extreme environments. The Insulated security panel slides from the side, locking the pet opening. All Security Boss products are hand built to order.

All Security Boss Inserts come with an extendable brace bar that will lock your door into place. 

Each unit has dual pane thermal glass which is framed by a heavy duty aluminum, powder coated frame. There is an adjustable end that is spring loaded for easy installation or removal. The MaxSeal Sash Window Pet Door is the only dual/paned insulated sash pet door that does not require permanent installation, no screws or hardware.

Inserts are available in WHITE only
Pet Opening
width x height

(in inches)

(in inches)

7" x 9"
14" 23-26.25
starts at
9" x 12"
17" Pricing
starts at

11" x 16"
21" Pricing
starts at


MaxSeal Insulated
Dual Pane Glass - Dual Flap Sash Window Pet Door

All Security Boss Window Insert will fit channels that are at least 1" wide.
The adjustment ranges are the minimum & maximum that a unit will contract. Make sure you allow for the depth of your window channel when selecting a range. Call us for assistance: 608-781-7385
American Owned | American Made

MaxSeal Dual Pane/Dual Flap
Sash Window Pet Door

Security Boss Manufacturing LLC Sash Window Pet Door Features

Measuring for your window insert:

To determine the correct range of window insert you need, open your sash window and measure from left to right inside the channel that the sash window travels up and down in. You want to measure into the deepest part of the channel since the window insert will expand due to the spring loaded end. Your measurement should be with the adjustment range chosen. You might notice that your measurement falls into two ranges, select the once that will allow soem room below and above your window width. This will allow the unit to compress enough to insert into your channel and still expand enough for a tight fit. You can always call us for personalized guidance to ensure your choice is correct.

Will These Insert fit all Sash Windows?

All Security Boss Window Insert will fit channels that are at least 1" wide.

Included Weather Stripping:

[photo] Security Boss Patio Pet Door top Section

Every Security Boss Patio Insert features a replaceable bulb seal that lines both sides of the insert. This bulb seal provides a superior weather seal between the insert and the wall and sliding door. This weather seal can also be replaced if needed very easily by sliding the weatherstripping into the t-slot groove on your patio pet door.

The Weather Seal is a 3" wide vinyl weather stripping section that attaches to the back side of your sliding door. When an insert is installed, your sliding door breaks the seal between the slider and fixed panel. This weather stripping will seal out any drafts.

Adjustable Width Range:

You will notice that your Security Boss Window insert has a spring-loaded end that compresses and extends within a range of 3.25" This allows you to compress your unit to fit into the channel that you sash window travels and then extend so that the unit will fit tightly. The two easy turn locking knobs secure this end so that someone from the outside would not be able to gain entry.

  [photo] Easy Adjusting Height | Patio Pet Doors

How does my Sliding Door Lock?

We strongly suggest bracing the open sash window with a stick or an adjustable brace bar; as this immobilizes your slider and is the most effective way to secure your sliding door. We also offer several locking devices that can lock the open window to your frame via various bolt type locks.

Use of Extensions Ranges:

You can add 2 inch extensions to the top of all insert heights to extend their reach or adjustment range. These extensions snap into the top of your insert and fit tightly. No screws or hardware are required. It is possible to add more than two (2) extensions on the Security Boss Inserts. The snap in lock feature of the extensions allow for a stable firm unit regardless of the number of extensions are added.

Click for More Info & Pricing
Dual Pane - Dual Flap
Best Insulated Unit
Secure When Locked Off
5 Star Rated Pet DoorInsulated Pet Door

The Glass Guru

Pricing starts at: $536.99
Complete pricing chart at bottom of this page

Fits Openings From 23" to 52 1/4"
Dual Pane Glass | Dual Flap Pet Door
Best Insulating - Best Sealing - Most Secure