Rald wrote:
A buried 25' run of 3" tile pipe catches the water from two downspouts
and then discharges the water to daylight. I would like to extend the
buried trench another 50' with 4" sewer drain pipe. What are some good
ways to connect these two pipes so that the connection seal won't fail
and fill with dirt? Thanks for any thoughts on this.


http://www.fernco.com/NH.html


You may not find that size at HD, but a good builders supply
yard will surely have it. The "Mission" style coupling
would be best in this app.

Jim