The G-Series PolarDawg is the cap for the Optimus Polaris Optifuel stove. It reduces the loud sound from your Polaris with flame plate. And, it enables you to simmer at low flame levels that the Polaris with flame plate will not support. Because the burner in the Polaris is not the same as the one in the Nova-series stoves, this silent damper cap is the one you want to get for the Polaris. It works well with all three fuels the Polaris supports - even isobutane canisters in inverted mode. The PolarDawg silent cap is also excellent for use with the Trangia X2 75001 burner made by Primus.