GT Bow-Constrictor | Sash Seal Enhancement

In stock

  • White
  • 10mm Spring
  • 4
Part Number:

RRP: £12.50 +VAT

Trade Price:
Apply / Login

To order a box, please order 50

Code Finish Size Number of Fixings Required Stock Box Qty RRP Trade Price Qty
GTB10000 White 10mm Spring 4 10+ 50 £12.50 Apply/​Login
Prices are excluding VAT


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.


  • 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
Box Quantity 0
Part Code GTB10000

Product Downloads