Defender Standard


  • Improved weather sealing and draught proofing performance from extended enclosed end cap and asymmetrical vent arm form to meet BS 6375 - 1
  • Patented liped slider for enhanced smooth operation
  • Easy friction adjustment without metal to metal contact
  • Unique patented robust cam fricition device eliminates any risk of friction screw misuse.
  • Available in standard ferritic or austenittic stainless steel for enhanced corrosion resistance.
  • Available with built in restrictors


  • Long and reliable working life tested to 30,000 cycles
  • 10 or 12 year guarantee  dependant on material selection (details avaiable upon request)
  • Standard ferritic tested to BS EN 10088-2 Grade 1.4016
  • Austenitic stainless steel ested to BS EN 10088-2 Grade 1.4301 for enahnced corrosion resistance
  • Police approved Secured-By-Design
  • BBA certification