The inner diameter of the pump is 63 mm, the diameter of the neck of a 19L bottle is 55mm, and the diameter of the neck of a 5L bottle is 47mm. Judging by these figures, it becomes clear that it will not hold on to a 5l bottle at all, on a 19l bottle it dangles quite strongly, although it did not fall. But since "I'm an engineer with my mother") for a 19l bottle, a winding of four pieces of paper towel was used, and for 5l, all the power of engineering was used, through which a miracle adapter was designed (shown in the photo). How much it from one charge has not yet been evaluated. The pump pumped so far only 19l. In general, while 4 stars, with a possible decrease in the course of operation.
I hope the photos I added make my review more helpful and informative.
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