Garage Door Plunger Bumper Spring, easy to install, is the perfect spring for your sectional garage door. This plunger bumper spring is made of strong galvanized steel to help control cable tension. It allows stroke and approximate compression of 10 psi. These plunger bumper springs are sold in pairs.
Material: galvanized steel
There are 27#, 15#, two types spring bumper
The garage door plunger bumper spring is adapted to assist the elevated door, and when controlled by a jack door operator, the horizontal track is closed from the fully open position. This type of operator is typically used when the track is partially or completely vertical above the door, and the full weight of the door can pull the balance cable down, maintaining tension on it and preventing the cable from coming loose.