Temperature-sensitive, this trusty mechanism will ensure the internal temperature of your Greenhouse or Glasshouse is set to your required temperature while removing the need for you to open and close vents.

The Hartley Range of Colours

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  • Hypca White
  • Country Stone
  • Verona Stone
  • Umbria Light
  • The Olive Leaf
  • Mist
  • Vista Grey
  • Iron Grey
  • Forest Green
  • Bronze
  • Manganese Graphite
  • Black Olive
  • Dark Bronze
  • Black
  • Ruby Red

The colours you see on the website are a guide, and will differ by viewing device.

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