I had thought they(gelert) might worry about being sued:
Gelert has (from what I’ve read) had to pull a couple of items off of the market. One was an adapter that would connect a 100% butane canister with a bayonet connector to a stove with a standard threaded connector. Apparently there were some quality control issues. They had a stainless steel disk shape arrangement on one end and a threaded brass connector on the other. This type is still available from China. NOT recommended.
The Kovea connectors that accomplish the same thing are a good product, but they have a connector that is completely different and their’s is secure.

