Wanna bet?
Not arguing, but how the heck can you "drain a lake" with a 4" pipe? Or is this a teensy-tinsey little "lake"?
My "pond", which is only 1 acre-foot would take a couple of weeks to drain through a 4" pipe.
Those square-shank handles are common stock, but I cannot remember from where yet. It'll come.
Ahhhh.... remembered before I hit send. Check with an irrigation supply.
LLoyd