It is completely waterproof: The patented special rubber cable reel GT 310.WS3-IP67 may even fall into water. This makes it perfect for use in fire departments, in mining or shipbuilding, by technical relief organizations or by the military. Bayonet locks and high quality seal ensure that the cable drum meets the high IP67 protection standard. This means that it can withstand even the most adverse conditions and thus makes helpers' work much safer.
Find more information here: https://www.schill.de/en/products/ip67-cable-drum/