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Drainage and backflow

Water Management

Every drop has to go somewhere. Fernco drainage and backflow products move stormwater off the property, out of the basement and out to the outfall, and keep it from coming back.

Flap valves Channel drains Downspout connectors Check valves Debris traps
Start with flap valves or watch on YouTube
 
Featured · Stormwater outfalls

Flap Valves

Water flows out. When the water outside rises, the flap closes on its own. No power, no operator.

Corrosion-resistant HMWPE flap gates for outfalls and drainage systems where rivers, ponds and tides push back.

Explore flap valves Spec documents
Fernco wall mount and spigot mount HMWPE flap valves
Tap a + to exploreFive details that set Fernco flap valves apart.
4″–24″12 sizes, wall or spigot mount
Class 5Exceeds DIN 19569-4 Class 5 and BS 7775 leakage rates
316Marine-grade stainless hardware
Follow the rain

From the roof to the outfall

One storm, four places water causes trouble, and the Fernco product for each.

  1. 01 · The roof

    Downspout Connectors

    Rain off the roof needs a way underground. Connect a downspout to a 3″, 4″ or 6″ drain line with no clamps or glue.

    View downspout connectors ›
  2. 02 · The driveway

    StormDrain Plus

    Water pools at the garage door and across the patio. A modular channel drain catches it, rated for cars and light trucks under 20 mph when set in concrete.

    View StormDrain Plus ›
  3. 03 · The basement

    Sump Pump Check Valves

    Groundwater fills the sump pit and the pump sends it out. A check valve keeps it from falling back in. Threaded or slip, with a quiet ProCheck model coming November 2026.

    View check valves ›
  4. 04 · The outfall

    Flap Valves

    City storm lines end at a creek, pond or shore. A flap valve lets the water out and keeps high water from backing up the pipe.

    View flap valves ›
Do the math

How much water comes off your roof?

An inch of rain on a roof adds up fast. Most of it lands at the downspouts and runs across whatever is below them.

One inch of rain on one square foot of roof is about 0.623 gallons (USGS: 27,154 gallons per inch on an acre). Measure the roof footprint, not the shingle area. Assumes all of the rain reaches the gutters.

Water off the roof
1,246

gallons in one storm

312gallons at each downspout
2355-gallon drums
Send it underground Catch it on the driveway ›
A well driller lowering a PVC liner with a debris trap clamped below a coupling Water wellsWater Well Debris TrapsBelow ground, loose rock and sand can fall down the gap around a well liner. A flexible shale trap blocks it before it reaches the screen and pump.View debris traps ›

Where to next

Stock it, spec it or put it to work.

Distributors and retailers

Carry Fernco water management

Flap valves, channel drains, downspout connectors, sump pump check valves and well debris traps. A full drainage and backflow line from a supplier you already know, with Fernco reps behind it.

  • Products for homeowners, contractors and municipalities
  • Sell sheets, drawings and install instructions ready to share
  • Fernco reps in the field to support your counter and your customers
Become a distributor See the catalog pages ›
Engineers and municipalities

Specify it

Cut sheets, drawings and submittal packs for every flap valve size and mount, plus a rep who can walk the site.

Flap valve documents › Find a rep ›
Contractors and homeowners

Buy it

Find Fernco products at plumbing supply houses and hardware stores near you.

Where to buy › Ask a product question ›