VEVOR Trench Drain System, Channel Drain with Plastic Grate, 5.9x7.5-Inch HDPE Drainage Trench, Black Plastic Garage Floor Drain, 5x39 Trench Drain Grate, with 5 End Caps, for Garden, Driveway-5 Pack

Each section is open at both ends, but each section is connected to the lower section. So, if you use 4 meters or 5 meters, after connecting 5 sections together, both ends are empty. You can seal both sides with the end cap. If you want to drain water from both ends, there are also water outlets on the end cap.

My husband said it should be no reason it can’t be cut, but he didn’t have to cut for his application. He suggested that you ask the manufacturer.

It is 15 years.

No, empties from the bottom , at the end.

Sorry, a slightly heavier system is not available currently.