There is most likely 1" PVC or 1" Galv pipe under that elbow holding up the pump. It is not a problem to rotate any direction you want. Tightening the four bolts squeezes a gasket that seals off the pipe and casing. It won't seal off the wire hole though, that is why there is silicon in there. But the silicon won't stay there either because you don't have a vent. The little 1/2" PVC cap need to be a screened vent pointed down. Otherwise you just blow out the silicon.