Trangia Gas Burner
Here's what other sites are saying:
The Trangia Gas Burner, Primus system is an alternative to Trangia's spirit burner. This high efficiency, easy to control camping gas burner fits in the lower windshield as an alternative burner for the Trangia alcohol stove. Comes with a cover and weighs 180 g.
- Mountains Plus
The Trangia Primus Gas Burner fits in the lower windshield of the 25 or 27 series stoves as an alternative to the spirit burner. It runs on standard butane cartridges with high efficiency and easy control.