SHOULD YOU DO WATER CROSSINGS WITHOUT THIS?! - Diff and Gearbox Breather Install 

and throwing...😂😂

Yeah that's a good point mate, general rule of thumb is one every now and then wo t hurt but if you're doing water crossings alot you should have breathers as when the gearbox and diffs get hot then quickly get cooled by being submerged they suck water in due to the vacuum created by the sudden cooling which then can cause the seals in the diffs and gearbox to blow out from the pressure increase once hot again