GT BOW CONSTRICTOR is a spring device designed to improve the seal of a sash
between the lock and hinge sides i.e. on the vertical sides of large top hung window.
It consists of an acetal moulding set and two sizes of spring steel components which
together universally fit all 13mm and 17mm stack height PVCu systems.
The simple act of closing the window causes the unique GT Bow-Constrictor device to
assist the compression between sash and frame.
It also allows the use of night vent locking positions
PROFILE SPECIFIC - PLEASE CONTACT SALES OFFICE BEFORE ORDERING TO ENSURE PROFILE IS AVAILABLE