whats this hole do then?

[glen76]

what this hole on my alpha leg do, one on both sides

 

[Captain Chaos]

looks like what they d to relieve exhaust pressure

 

[Gav]

yeah think its a breather.........

 

[glen76]

thanks guys

 

[OLD PHART]

The holes are to let out the water that is inside the casings when afloat, they should always be kept clear as the motion of the boat also washes out any crap that accumulates inside. if it aint kept clear the whole thing corrodes and splits.