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Zero Drips. Fits Your 4-Inch Bumper.

Cosari DuraFlow 24

Two 10-foot sections with 24-mil TPE walls that stay flexible in the cold, gasketed swivel fittings that seal without twisting.

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  • 24-mil TPE walls resist gravel pinholes and cold-weather
  • 360° swivel bayonet fittings with gasket seals
  • Clear 90° 4-in-1 elbow fits 3-inch to 4-inch
  • Capped sections slide into standard 4-inch bumpers
Cosari DuraFlow 24
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Built for the Parts That Usually Fail

Most sewer hoses leak at the collar, pinhole on gravel, or crease in the cold. We engineered the DuraFlow 24 around those three problems.

24-Mil TPE Armor

Walls twice as thick as standard vinyl, with raised wear ribs that keep the hose belly off sharp gravel. It recovers from a 320-lb crush and pops back to round.

360° Swivel Bayonet

Pre-attached collars turn freely, so you lock onto the outlet with a quarter-turn without fighting hose twist. Four locking prongs and a gasket seal each joint.

Clear 4-in-1 Elbow

Threads into 3-inch slip and 3-inch, 3.5-inch, or 4-inch NPT sewer inlets. The clear body shows you exactly when the tank rinse runs clean.

4-Inch Bumper Fit

With a 3.9-inch maximum lug diameter, both capped sections slide into a standard 4x4 square steel bumper once the elbow is removed.

How the DuraFlow 24 Works

Step on It. It Comes Back.

Step on It. It Comes Back.

TPE is an elastomer, so it flexes instead of cracking. Step on a coil, even on a cold morning, and it returns to round in about a second.

Quarter-Turn Lock, No Twisting

Quarter-Turn Lock, No Twisting

The swivel collar rotates independently of the hose. Twist it onto your RV outlet and the gasket seals while the hose stays where you laid it.

Watch It Run Clear

Watch It Run Clear

The clear elbow sits at the ground inlet. Flush until the water inside is clear, and you know the tank is clean.

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Cosari DuraFlow 24

Heavy-Duty 20-Ft TPE RV Sewer Hose Kit with 360° Swivel Fittings, Clear 4-in-1 Elbow, and Storage Caps

Backed by our 30-Day Money-Back Trial & Full 2-Year Cosari Warranty.

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30-Day Money-Back Guarantee plus a full 2-Year Warranty.

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Description

Two sections, one system: The 20-foot kit is split into two 10-foot sections. Use one at close full-hookup sites, and connect the second for distant dump stations. Each section holds whatever length you pull it to, so it will not spring back out of an unthreaded inlet.

Fits nearly every RV and campground: Standard 3-inch 4-prong bayonet fittings connect to almost every RV waste valve. The clear 90° elbow threads into 3-inch slip and 3-inch, 3.5-inch, or 4-inch NPT sewer inlets, and the 3-inch bore sits in standard hose supports.

Clean, drip-free storage: Four twist-lock caps seal both ends of each section, keeping leftover rinse water inside the hose and out of your bumper. Remove the elbow, cap up, and slide the sections into a 4-inch bumper or utility bin.

Shipping & 30-Day Returns

Free Shipping: Every order ships free with full tracking within 24 hours.

30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.

2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.

Why Choose the Cosari DuraFlow 24?

Cosari DuraFlow 24 Detail

Flexible Down to -20°F

TPE stays pliable on cold shoulder-season mornings, when stiffer plastic hoses are most likely to crease along the folds.

10 + 10 Foot Reach

Two interlocking sections mean you never wrestle 20 feet of slack for an 8-foot hookup.

Odor-Seal Caps

Twist-lock caps on all four ends keep odors and drips sealed inside, whether the hose lives in your bumper or a storage bay.

Cosari DuraFlow 24 vs. Ordinary Alternatives

Cosari DuraFlow 24Standard Competitors

FeatureCosari DuraFlow 24Standard Competitors
Hose wall24-mil abrasion-resistant TPE12 to 15-mil vinyl or stiff plastic
Cold morningsFlexible, rated to -20°FStiffens and can crease along the folds
Fittings360° swivel bayonet with gasket sealFixed or friction-fit collars
Bumper storage3.9-inch lugs fit 4-inch square bumpersBulky fittings often need a separate bin
Complete 20-ft kit price$39.99 with elbow and 4 caps$52.99 to $149.99
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What's Included

In the Box
  • 1 × 20-Ft Sewer Hose Set (2 × 10-Ft TPE Sections with Pre-Attached 360° Swivel Bayonet Fittings)
  • 1 × Clear 90° 4-in-1 Dump-Station Elbow Adapter
  • 1 × Set of 4 Twist-Lock Storage End Caps
Technical Specifications
  • Length: 20 ft total (2 × 10-ft sections)
  • Compressed Length: 39 in. per section
  • Wall: 24-mil abrasion-resistant TPE, 3 in. inner bore
  • Fittings: 360° swivel, 4-prong bayonet with gasket seal
  • Elbow: Clear 90° 4-in-1 (3 in. slip, 3 in., 3.5 in., 4 in. NPT)
  • Operating Temperature: -20°F to 150°F
  • Maximum Lug Diameter: 3.9 in.
  • Kit Weight: 6.8 lbs
Care & Safety
  • After each dump, rinse the hose with grey water or a dedicated rinse hose, then hold one end high to drain any remaining water before capping. Never use your drinking water hose to rinse it.
  • Store the hose capped and out of direct sunlight when possible. Before freezing nights, drain it completely so no water is left to freeze inside the corrugations.
  • Backed by our 30-Day Money-Back Guarantee & 2-Year Warranty
  • Customer Support: support@buycosari.com
In the Box Cosari DuraFlow 24

Hook Up, Dump, and Pack Up in 3 Steps

Swipe left for steps 2 and 3

  1. Slide Out and Twist On
    1

    Slide Out and Twist On

    Pull a section out of your bumper, remove the cap, and quarter-turn the swivel bayonet onto your RV's waste valve. Add the second section if the inlet is more than 10 feet away.

  2. Thread the Clear Elbow
    2

    Thread the Clear Elbow

    Screw the 4-in-1 elbow into the campground sewer inlet, then lock the hose's bayonet end onto the top of the elbow.

  3. Flush, Cap, and Store
    3

    Flush, Cap, and Store

    Open the valve, dump black then grey, and watch the elbow until the rinse runs clear. Disconnect, cap all four ends, and slide it back into the bumper.

Verified Customer Reviews

What 200+ Verified Buyers Say About the Cosari DuraFlow 24

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97% of buyers recommend the Cosari DuraFlow 24
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Customer photo
✓ Verified Purchase
Gary & Linda M. — Grand Rapids, MI3 days ago

Finally a TPE hose that actually slides into a standard 4-inch square bumper!

I loved the TPE material on my old yellow-lugged hose, EXCEPT the bulky wings wouldn't fit inside my standard 4-inch square rear bumper without taking a hacksaw to the plastic ears. Decided to try the Cosari DuraFlow 24 because of the low-profile slate-teal collars. Both 10-foot sections slide right into my bumper with the locking drip caps on! We just did 12 days on crushed limestone in northern Michigan—dragged it over sharp gravel and stepped right on it taking the dog out at 33 degrees. Popped right back to round like a tire with zero creases.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Dale R. — New Braunfels, TX6 days ago

Thick rubbery walls and the swivel collars don't weep at the crimp

Second season out with my big-box orange poly hose and the collar started weeping brown water right where the hard plastic threads onto the spiral. Never buying stiff polyolefin again. Laid this Cosari kit out on my garage workbench before our first trip and you can feel the weight difference immediately. The 360-degree swivel bayonet lugs turn butter-smooth so you aren't fighting hose memory under your slide-out in 90-degree heat. Locking end caps seal watertight too.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

✓ Verified Purchase
Mark T. — Bend, OR1 week ago

Clear 90-degree elbow is worth its weight in gold

Nothing humbles a grown man faster than a cheap unthreaded dump adapter popping out of the ground under full black-tank pressure with a line of fifth wheels watching. This 4-in-1 clear elbow threads deep and tight into worn-out state park PVC rings. Best part is the crystal-clear neck—you know the exact second your black tank back-flush runs clean instead of guessing.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Kevin S. — Ocala, FL2 weeks ago

Having two 10-foot sections instead of one giant 20-foot snake is huge

Honestly 80% of the full-hookup sites we visit only need 10 feet of reach. With our old 15-foot one-piece hose I had extra coils snaking all over the site collecting leaves. With the DuraFlow 24 I just use one 10-foot section most of the time, and when the sewer pipe is way back by the rear bumper, I clip on the second 10-footer in five seconds. Zero odor around our patio side even when hooked up for a full week in Florida.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Brian & Tammy K. — Flagstaff, AZ2 weeks ago

Goodbye dealer slinky pinhole leaks

The cheap black vinyl slinky the dealer threw in our bumper turned into a pinhole sprinkler the second time it dragged across gravel at a KOA. Upgraded to the Cosari DuraFlow 24 and the external wear guard on the spirals is noticeably beefier than the $85 kit at Camping World. It also stays at whatever length you pull it out to instead of acting like a giant bungee cord trying to yank itself out of the sewer hole.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Richard H. — Knoxville, TN3 weeks ago

Four heavy locking prongs and thick internal gaskets

My hands have some arthritis and wrenching a twisted hose onto the dump valve used to be my least favorite camp chore. Because these bayonet collars swivel a full 360 degrees independently of the hose body, I just line up the four prongs and click it home with zero torque against my wrists. Not a single drop or smell all season.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Chris P. — Coeur d'Alene, ID3 weeks ago

End caps actually keep nasty rinse water out of my bumper

Even after rinsing thoroughly, there's always a half cup of grey water hiding in the pleats. The four included storage caps twist-lock onto both ends of each 10-foot hose with a real gasket seal. No more nasty rinse drips rusting out the inside of my steel bumper on the drive home.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Jeff W. — Rapid City, SD1 month ago

Rock solid kit, just detach the clear elbow before sliding into a 4" bumper

Just a quick heads up for anyone with a standard 4x4 steel bumper: the two 10-foot hoses with their swivel lugs and storage caps slide inside a 4-inch bumper with room to spare, which is awesome. You just have to unclip the clear 90-degree elbow first and toss the elbow in your wet bay bin, which you'd want to do anyway. Hose material is super tough.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Steve & Brenda L. — St. George, UT1 month ago

Survived 26-degree mornings in Utah without stiffening up

We boondock and camp late into November. My old blue poly hose turned into a brittle PVC pipe the second temps dropped below freezing and cracked along the crease when I packed it away. This TPE rubber stayed flexible at 26 degrees when we broke camp in Moab. Compressed right back down to 29 inches without a fight.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Dan V. — Fayetteville, AR1 month ago

Half the price of the big retail store brands and better thought out

Looked at the big-name hoses at the RV dealership and couldn't stomach paying nearly ninety bucks for plastic that doesn't even fit in the bumper. Got the Cosari DuraFlow 24 for half off and every piece feels heavy-duty. The translucent 4-in-1 adapter locks into 3-inch, 3.5-inch, and 4-inch pipes without needing a heavy rock on top of it.

Verified Purchase · Austin, TX · Cosari DuraFlow 24

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Frequently Asked Questions

Will the DuraFlow 24 fit inside my 4-inch square rear bumper?

In most cases, yes. The largest lug measures 3.9 inches across, and both capped sections slid into our 4x4 welded steel bumper once we removed the clear elbow. We recommend measuring the inside of your bumper first, because weld seams or rust can narrow the opening.

Is it one 20-foot hose or two sections?

Two 10-foot sections that connect together. Use one at close full-hookup sites, and add the second when the sewer inlet is farther away.

Does it fit my RV's waste outlet?

It uses the standard 3-inch 4-prong bayonet fitting found on nearly all RV waste valves, with a gasket inside the collar to seal the joint.

Can I use it in cold weather?

The TPE is rated from -20°F to 150°F. In our 28°F test it stayed flexible and returned to round after being stomped flat. As with any sewer hose, drain it fully before freezing nights so water does not freeze inside.

Will it sit in my hose support?

Yes. The 3-inch bore sits in standard accordion-style RV sewer hose supports.

Do I have to ship back a used sewer hose if I want a refund?

No. You have 30 days to try it on real hookups. If something is wrong, send Coldwright Customer Care a photo and they will arrange a replacement or refund. You never have to package up and ship back a used sanitation hose.

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