I want to show you every single connection that you're going to need in your outdoor DIY project.
First, for perforated pipe, always use an internal coupler. The way we use perforated pipe we always use a drainage fabric so we're never moving debris through our perforated pipe. Now for solid pipe for a roof runoff system you will want to use an external coupler. Otherwise the leaves and debris will get hung up on the internal fitting. This is really important. I cannot emphasize this enough.

FDM Fittings and Couplers

4"Corrugated Internal Coupler for Perforated Pipe
https://frenchdrainman.com/store/4co...

4" Corrugated External Coupler for Solid Pipe / Roof Runoff
https://frenchdrainman.com/store/4si...

Corrugated Pipe Adapter aka Cone (4 in. corrugated to 4 in. SDR 35)
https://frenchdrainman.com/store/fren...

4" Corrugated Pipe Adapter to Thin Wall or SCH 40 PVC:
https://frenchdrainman.com/store/corr...

Coupler to connect Thin Wall SDR 35 to SCH 40 PVC
https://frenchdrainman.com/store/coup...

Coupler to Connect Any Popup Emitter to PVC Schedule 40
https://frenchdrainman.com/store/coup...

Pop Up Emitter Risers:
https://frenchdrainman.com/store/pop...

French Drain Man – Michigan’s Yard Water Drainage Experts. Masters in the art of constructing contained French drain systems & curtain drain systems that and fix your yard drainage problems for years to come. Over 30 years’ experience in solving yard water drainage problems in Oakland, Macomb, Lapeer, and St. Clair Counties.

French Drain Man / Sherwood Landscape Construction, LLC
P.O. Box 777
Almont, MI 48003
2485053065

https://www.frenchdrainman.com
http://www.macombcountylandscaping.com

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Every Yard Drainage Connection. Ultimate Guide For Corrugated Pipe & PVC Pipe [ Buried Downspouts ]