A: The stated 25 foot length is when fully extended.
A: Yes they can, with available connectors they connect to each other and to other types of drain pipe. The length is easily adjusted from 12 up to 25 ft each.
A: This one is solid.
A: this item is solid pipe. there are options for perforated pipe as well, but this item is solid
A: if using an inlet, or inlet structure this can be used. You may want to consider the perforated pipe as well.
A: Yes, I dug mine in about 14 inches on one side and 24 inches at another location due to a large slope. Both work great.
A: You can find the 3x4 downspout adaptor for this pipe here: https://www.homedepot.com/p/Advanced-Drainage-Systems-4-in-x-4-1-4-in-x-3-in-Polyethylene-Slip-Downspout-Adapter-0465AA/100201025
A: 4" ADS corrugated drainage fittings work with this pipe, the ends are the same design as standard singelwall corrugated pipe.
A: The tube has a male end and a female end so the can be screwed together to make a long run.
A: It is designed to sit std downspouts. It also appears to be made to then fit into a 4 inch nds drain system as well. You use this so you do not have a big 4 inch drain pipe sitting in your house beds. You can expand or collapse to fit your application. I plan to cut one end off as it will not connect to a 4 inch drain. The other end fits the downspout plastic adapter perfectly.
A: The ends are larger to connect to another pipe or fitting.
A: You should be able too. I just measured the end and the diameter is 4 1/2 inches so you should be able to slide it over the 4 inch PVC. You could then connect it with some small screws or good old duct tape.
A: Yes, you can connect this pipe to a 4 inch solid PVC drain pipe.