DIY Automatic system for lubrication and sealing of RC jet pump

Steel tube: Length 185mm, Outside Diameter 19,5mm, Thickness 1mm
Screw: M6x35 and nut 6mm
Spring: Length 140mm, Diameter 10 mm, Thickness 1mm
Aluminium disc diameter 17mm, Thickness 2mm
Syringe 5 ml
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[@ademczuk]

I also have a similar setup. Is this really required?

[@NIK7A]

Hi, I am using two 3S 5000mAh Lipo batteries and the running time is more than twenty minutes (about 25 min)! The grease in the jet pump is not enough for pump lubrication and boat sealing so long running time (especially if you run too fast). With this system I solved this problem! So, for my case is essential!