The E900 HARDWARE P730 30 in. Plug-End Extension Spring is a Holmes spring replacement for one piece garage doors. 2 x P730 springs handle up to a 150 lb. garage door while 4 springs will support up to a 300 lb. garage door. P730 springs are also a popular installation on toy hauler doors.
- There are normally 2 P730-C springs on heavier, 2-car, 16 ft. or taller foot 1-piece garage doors
- Length over coils: 30 in.
- Outside diameter: 1-5/16 in.
- Wire gauge: (0.177) #7
- Initial tension: 110-120
- Maximum allowable stretch: 20 in.
- Manufacturer warranty: 1-year