Security Boss SB Standard Sash Lockable Window InsertDescription Security Boss SB Standard Sash Lockable Window Insert Pet Door The most budget friendly utility pet door for sash windows is the SB Standard Window Pet Door by Security Boss Manufacturing. Tempered safety glass and an adjustable, spring loaded end allow for simple installation and removal on each unit. As you look out the window from inside your house, you can choose whether the pet door is on the left or the right side. All Security Boss