This is the BernieDawg DAWG-A-NOVA silent damper cap for the Optimus Nova, Nova+ and Hiker+ backpacking and mountaineering stoves. These caps can also be used in vintage Trangia Multi-fuel burners based on the Nova design. Dawg-A-Nova DOES NOT FIT POLARIS. A DAWG-A-NOVA silent damper cap will reduce the volume level of your Optimus Nova, Nova+ or Hiker+ stove by a substantial amount, about 1/2 of normal sound volume levels at high flame, more sound reduction at low flame. It also makes your stove a better simmering stove. It's the original and best silent damper cap for the Optimus Nova, Nova+, Hiker+ or Trangia Nova Multifuel stoves.
BERNIEDAWG F-SERIES SILENT DAMPER CAP INSTRUCTIONS