This Trainee Plumber Thought He'd Installed His First Toilet... But There's Just One Problem

This Trainee Plumber Thought He'd Installed His First Toilet... But There's Just One Problem
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This plumbing apprentice was ecstatic when he finally finished installing his first toilet - but he'd failed to take on very important factor into account. Check out the video below and see if you can tell where he went wrong before it's hilariously pointed out to him.