Many thanks to Sumtin on irv2.com. His advice saved the day.
Its called a quick connect. At the top end of the QC assembly (the white part) there is a plastic ring that's a part of the assembly. To remove just push upward on the main body of the connector against the ring ( which does not move). While pressing up hold the ring and main body together with your fingers then pull the whole assembly down. It should come off but you might have to struggle with it a bit. The trick is you have to keep the ring and main body squeezed together as you pull down. Hope that help.