Poseidon's Cyklon Super 300, was a popular and reliable SCUBA regulator, requiring relatively simple maintenance but which offered performance and reliability better than most - apart from the DIVATOR, which, even today, remains by far the best performing SCUBA regulator in the world.
This is a free down load for the original Cyklon user instruction, for those divers who still have one but who may have lost the manual that came with the kit.