VIK...............
I am sure you read my other post and open a new topic, you can ask me about the same in "Difference 2 other CNG Kits" so no 1 get confused.
If you are talking about the CNG/LPG reducers and its stages, here is the reply.
In CNG reducer gas reach at 200bar (2940psi), so different kits reduce it on first stage in regulator / reducer to 70 - 50 bar and then 2nd stage from 3 - 4 bar, then 3rd at atmospharic to introduce it to the engine.