Here is the BernieDawg OmniDawg 2 "silent" damper cap for the Primus Omnifuel backpacking and mountaineering stove. This cap functions well on all three fuels that the Primus Omnifuel stove is designed to use and does so with the correct and proper jets designed for those fuels. The cap will reduce the volume level of your Primus Omnifuel stove by a substantial amount, about 1/2 of normal volume levels at high flame, more reduction at low flame. It also makes your stove a better simmering stove. All BernieDawg OmniDawg 2 caps can be used with kerosene, Coleman fuel or isobutane canisters. The BernieDawg OmniDawg is the original silent damper cap for the Primus Omnifuel offered by the original designer and builder of silent caps for modern backpacking stoves. If it's not a BernieDawg, it's just an imitation.