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.
Get the proper "fernco" coupling. These are rubber (with hose clamps)
which come with plumbing pipe sizes on each end. For use in
non-pressure applications, like yours. See a good plumbing supply store.
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