Well i did put a check valve in the i put a heavy duty sump pump in it and it requires you to put a check valve in it which i did.
Hook sumppump to gutter drain.
Try to maintain the line at least on a half yearly basis.
So it would be preferable that you drain a sump pump outside and at least 4 to 6 feet away from your foundation of your home so it doesn t drop water back against the foundation wall.
The performance of the discharge line dictates how the pump is going to perform or how long it s going to last.
If the line gets clogged frozen or dysfunctional your sump pump will become useless sooner or later.
The home pictured below had a downspout discharging directly into an underground yard drain that filled with ice and ended up leaking a lot of water in to the basement during the course of my inspection.
Sump pump discharge line underground is a vital part of the sump pump.
Simply cut your gutter extender at a 45 degree angle and connect it to your downspout with the zip hinge and 8 screws.
Route the water into a storm drain or dry well.
Learn other downspout extender solutions here.