These rubber ferrules (feet) (pack of 5) are for use with the Dorgard fire door retainer. They fit to the bottom of the plunger to hold the door in an open position. Ref: 028.

NB: It is important that the rubber ferrules are regularly checked and replaced as soon as they become worn, to ensure that they operate effectively. They are quick and easy to fit to the bottom of the plunger.