Truma pump water pipe clip?

What is the name of the cir-clip that secures the water pipe to the 'Truma Ultra-flow' pump assembly.

Jubilee clips are too big to fit in the pistol top, you cannot fit the top half back.

and how to remove the existing from the pump pipe.

these are squeeze fitted not worm drive like the jubilee clip

many thanks

bobuk
May 2019