Buy a replacement spring hinge for your Heavy Duty Dog Door or Big Dog Door. This hinge connects the flap to the frame for smooth opening and closing.
Adjustable Spring Hinge - 4-Inch by 5/8-Inch Radius / Antique Brass
Oil-Rubbed Bronze Gate Hinges, Heavy Duty Self Closing Gate Hinges
UL Listed (Fire-Rated), For automatic closing of door, Includes screws for metal and wood doors
SPH - 4.5 x 4.5 UL Listed Spring Hinge
Spring Loaded Hinges Shop Spring Butt Hinges by Sugatsune
Heavy Duty Adjustable Spring Hinges are designed for screen doors, utility doors and anywhere a self-closing spring is desired. Self-closing spring
Hillman 3 in. Heavy Duty Spring Hinge - Adjustable - Galvanized
National Hardware N240-481 V628 Cabinet Spring Hinges in Brass, 2
STANLEY, Steel, Satin Bronze, Spring Hinge - 53DY65
x Home 2 Pack Self Closing Door Hinge 3 1/2 inch, Spring Hinge, Adjustable Tension for Interior Door, UL Listed, for Left and Right Hand Door, 5/8
Heavy Duty 4 Self-Closing Spring Door Hinge with 5/8 Radius Corners
For automatic closing of doors, Single acting spring hinge, square corner, Includes screws for metal and wood doors
1250 4 x 4 UL Listed Spring Hinge