This GT Bow-Constrictor clever spring device can be used to improve the seal of a sash at the vertical side of large top-hung windows. It can also provide a cost-effective, more tolerant alternative to the wrap-around gearing commonly used on oversized casements.

Features

• Recommended for use on windows over 1200mm tall
• Bow-Constrictors should be fitted just after the end of the friction stay
• Allows use of the night-vent locking position when required
• Packers and keeps included for every profile
• Quality manufactured in the UK
• White in stock. Also available to order in brown and tan