This is a reusable inflating device that should be positioned into the opening where the frame is being installed. It will act as a dam to allow the use of Flowable mortars without the need for a damming mortar. Saves the contractor money. Just wash down after use and reuse as necessary. Fully adopted by BT and other asset owners, these devices come in a variety of dimensions to suit popular clear opening sizes. They are fully re-usable and easy to carry in your vehicle. Use with CD354 istallations and with all BT carriageway installations.   Best used in conjunction with our SLOTFORM shuttering system, which is a reusable installation aid that defines the area where the flowable mortar is to be placed.