P728 28 inch Plug-End Extension Spring is a spring replacement for 1-piece/tilt-up/canopy-style garage doors. Two P728 springs - one on each side of the door - can handle a 90 pound to 150 pound. door, with an initial tension of 110 pounds to 120 pounds. Four P728 springs - two on each of the door - can handle a 150 pound - 300 pound. door. Either 4 c-hook's or 4 w-hook's (sold separately) are required to connect the springs to the jamb hardware
2 x P728 springs support 90 pound to 150 pound garage doors
4 x P728 springs support 150 pound to 300 pound garage doors
Length over coils: 28 inches
Outside diameter: 1-5/16 inches
Wire gauge: (0.177) no 7
Initial tension: 110 pounds - 120 pounds
Maximum allowable stretch: 18.5 inches
Manufacturer warranty: 1-year
