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IDEA from: Carmine Cantile - email: carminecantile@virgilio.it

An inflatable ball could be used, done with material highly resistant, to insert inside the duct of the leak and to fill it with air or gas like helium up to obstruct the duct of the same leak, from the inside side.

Carmine Cantile

VIDEO DEMONSTRATION:

IDEA from: Carmine Cantile - email: carminecantile@virgilio.it
IDEA from: Carmine Cantile - email: carminecantile@virgilio.it
IDEA from: Carmine Cantile - email: carminecantile@virgilio.it