Hi Markus,
Thank you very much, I also have 2 of your tank caps lying around, something should be able to be done there. As written, a bag would be my preference, but it's difficult to store.
Regards, Bernd
@ Schnitti
In my Kangaroo I had Jetcat P80, 2L Cocacola bottle with Graupner 1.25 dcl hooper tank. In cocacola bottle you need to put 30cm brass tube with tankfilc pendel at the end. All worked perfectly 100% no problem.