NuTone central vacuum tubing is the pipe behind your walls right now, and Broan-NuTone pulled its entire central vacuum line off the shelves in 2023. That scared owners into thinking their tubing died with the brand. Dealer pages feed the panic, calling the pipe proprietary so you buy whatever they stock.
Here’s what changes by the end: you’ll know the exact outer diameter, which NuTone part numbers still ship, and when Schedule 40 pipe belongs in the run. That matters whether you’re patching one fitting or choosing an installation kit for your system from scratch.
Keynote: NuTone Central Vacuum Tubing
NuTone central vacuum tubing is standard 2 inch OD, thin wall PVC built to ASTM F2158, not a proprietary part. It carries debris from every inlet to the power unit and outlasts that unit by decades. Buyers use it to spec new construction right, or confirm an old system still works.
Why NuTone Tubing Confuses Buyers in 2026
NuTone tubing confuses buyers because NuTone quit selling central vacuum systems altogether, and its own website now redirects central vacuum shoppers to a different manufacturer. The pipe already in your walls did not disappear. Only the brand’s involvement did.
NuTone quit central vacuums, but your pipes did not
NuTone, the brand Broan-NuTone LLC built through Nortek’s consolidation of residential ventilation and vacuum lines, discontinued its entire central vacuum category on August 31, 2023. The company’s own product pages confirm it, routing every central vacuum and accessory link straight to DrainVac.
Your wall of tubing did not get that memo. It keeps moving dust and dander to the power unit no matter who answers the phone for parts. And the pipe itself was never a Broan-NuTone invention in the first place.
Still holding onto a rough-in from a builder who spec’d NuTone twenty years ago? The tubing behind that drywall is unaffected by any of this.
Who actually makes and sells NuTone branded tubing now
DrainVac International, through its manufacturing arm Metal MP Inc. in Mont-Saint-Hilaire, Quebec, now builds every NuTone branded central vacuum power unit and accessory sold in the US. The NC3500, DrainVac’s current NuTone-badged 650 air watt unit, is a direct descendant of the old Broan-NuTone power units and uses the identical 2 inch tubing network.
Metal MP backs it with real coverage: eight years on the power unit and five years of parts and labor for that model, under current NuTone central vacuum warranty terms under DrainVac. One limitation worth knowing before you call for service: that warranty explicitly excludes the installed tubing system, so a leaking fitting behind your drywall is on you, not Metal MP.
Why dealer sites will not tell you it is generic
Dealer catalogs skip this fact because branded tubing sells at a premium over identical certified pipe. NuTone’s own historical compatibility documentation shows one pipe spec fitting nearly every brand sold in North America, not just NuTone hardware.
Knowing that changes where you shop. A supplier selling unbranded ASTM F2158 tube for less is not selling you a knockoff. It is selling you the same pipe without the label markup.
The 2 Inch Lie: What Size NuTone Tubing Really Is
NuTone tubing measures 2 inches outer diameter, not 2 inches inner diameter like the PVC sold at any hardware store. That single difference is why plumbing pipe never seats right in a vacuum fitting.
Outside diameter vs inside diameter, explained without jargon
Outer diameter (OD) is the full width measured across a pipe’s outer wall, the number vacuum manufacturers print on every spec sheet. Plumbing PVC is sized the opposite way, by inner diameter (ID), so a 2 inch plumbing pipe and a 2 inch vacuum pipe are two different sizes wearing the same label.
Think of two sleeves both tagged medium. One fits snug over a forearm. The other swallows it whole. The tag tells you nothing until you know which measurement it is tagging.
One DIYer’s hanger hack that proves the size gap
A forum poster working a weekend retrofit found this out the hard way: standard 2 inch plumbing J-hooks would not grip his vacuum tubing at all. The tube just rattled loose inside the hanger.
His fix worked because of the size gap, not despite it. Vacuum pipe slides cleanly inside a short offcut of plumbing pipe of the same nominal size, so he sleeved the ends and hung the sleeve instead. Skip that improvisation and buy pipe strap rated for central vacuum tube. It costs about the same as plumbing hardware and actually holds.
Is NuTone Tubing Proprietary or Just Standard Pipe?
No. NuTone tubing is standard 2 inch OD PVC certified to ASTM F2158, the same specification nearly every North American central vacuum brand builds to. Nothing about it locks you into one supplier.
The ASTM F2158 stamp matters more than the logo
ASTM F2158 is the certification standard covering material, dimensions, flattening resistance, and impact resistance for residential central vacuum tube and fittings. Building inspectors in many US municipalities check for this print line, not a brand name, when they sign off on a rough-in.
Check the pipe wall before you buy anything. Genuine vacuum tube carries the F2158 stamp molded right into the plastic, and the ASTM F2158 standard for central vacuum tube and fittings spells out exactly what that stamp is certifying.
Where can you still buy NuTone central vacuum tubing?
Genuine NuTone 3808 still ships in 8 foot semi-rigid PVC lengths through several electrical and vacuum suppliers, while independent manufacturers cut certified 2 inch OD pipe in 4, 5, and 8 foot lengths. Any F2158 certified tube glues straight into your existing NuTone fittings, regardless of whose name is on the box.
That is also why shoppers weigh Vacuflo pipe as an alternative when restocking a NuTone system. Compatible pipe from a different manufacturer is not a downgrade. It is the same standard, sourced somewhere other than a discontinued brand.
Old steel era NuTone systems use the same pipe
Your 1990s NuTone rough-in accepts today’s standard tubing without modification. Inlets, fittings, and pipe carried over across decades of NuTone models, long before Broan-NuTone shifted its power units from metal canisters to today’s plastic housings around 2003.
The one part that does not carry over cleanly is the filter bag. Bag shape and mounting vary by power unit model, so match that part number separately.
The Schedule 40 Fight Nobody Actually Settles
Dealers call plumbing PVC an automatic clog machine, and forum veterans running decades-old mixed pipe systems roll their eyes at that claim. Both sides are half right, and the debate over standard PVC vacuum tubing versus Schedule 40 rarely settles because it depends entirely on where the pipe sits in the run.
Dealers say never, and forum veterans roll their eyes
One installer’s thread describes a system running nineteen years on thin wall tube indoors and Schedule 40 buried outside to a garage inlet, with zero clogs traced to either material. The trouble installers actually see comes from fitting transitions, not the pipe wall itself.
Vacuum tube and plumbing pipe share a system for decades without trouble. They just do not share a joint without the right adapter.
What NuTone’s own installation guide quietly allows
NuTone’s documented installation guidance permits 2 inch ID Schedule 40 pipe when a dedicated adapter fitting handles the transition to vacuum-rated tube and fittings. Buried runs from the house to a detached garage are exactly where plumbing pipe earns its keep, since it resists the soil pressure and impact that thin wall tube was never built for.
Every adapter you add is still a potential snag point. Use them at transitions only, never mid-run out of convenience.
When mixing pipe types actually causes clogs
Clogs form at ledges, wherever pipe inner diameter changes abruptly or a fitting sits glued in backward. A rough hacksaw cut left inside a joint catches debris for years before anyone traces the problem back to it.
Fix a rough transition with this sequence instead of guessing at it:
- Cut every pipe end with a dedicated tubing cutter, never a hacksaw.
- Ream and deburr the cut edge until it is smooth to the touch.
- Dry fit the adapter and confirm the bore lines up flush with no interior lip.
- Glue the male end only, and orient every tee and elbow before the cement sets.
NuTone Part Numbers Worth Writing Down
NuTone’s current catalog keeps 3808 rigid tubing active while marking 3810, CF367, 3964, and 394 as discontinued. Knowing which is which saves a wasted search for parts that no longer ship.
| Part Number | Description | Length | Status |
|---|---|---|---|
| 3808 | Semi-rigid 2 inch OD PVC tubing | 8 ft | Active |
| 3810 | Semi-rigid 2 inch OD PVC tubing | 10 ft | Discontinued |
| CF367 | Flexible, wire-reinforced tubing | 36 in | Discontinued |
| 3964 | Rough-in kit, 3-inlet | Kit | Discontinued |
| 394 | Blank cover plate | Single | Discontinued |
Any certified ASTM F2158 tube or fitting from another supplier replaces a discontinued NuTone number without an adapter, since the bore and wall thickness match.
3808 rigid tubing and CF367 flexible tubing decoded
The NuTone 3808 semi-rigid 8-ft PVC tubing specifications confirm it as 2 inch OD white PVC, self-extinguishing, and conforming to UL requirements, exactly the workhorse for straight runs behind drywall. CF367 gave installers 36 inches of steel wire reinforced flex for tight bends near the power unit, though its discontinued status now pushes buyers toward equivalent flexible tube from other certified suppliers.
Flexible tubing belongs only in short, awkward connections. Straight runs should stay rigid, since flex tube adds drag every rigid pipe avoids.
The fittings that make or break your tubing job
Short 90 degree elbows go directly behind wall inlets on purpose, slowing debris just enough that it does not slam a tight bend at full velocity. Sweep 90s, with their wider curve, belong everywhere else the run needs to turn, and sweep tees must point their curve toward the power unit so airflow merges instead of colliding.
Match every part to fittings that match your tubing before you buy, since a fitting bore that is even slightly off will not seat, no matter how hard you push the joint.
Installation Mistakes That Turn Tubing Into a Clog Trap
Most tubing clogs trace back to installation shortcuts, not the pipe itself. Dry fitting, wire runs, and tool choice decide whether a system runs clean for twenty years or clogs every winter.
The tight elbow that would not fit a 2×4 wall
One retrofit installer measured a standard inlet elbow against a 3.5 inch stud bay and found it would not clear without notching the stud. Dry fit every inlet elbow inside the actual wall cavity before gluing anything.
Pipe touching drywall also transmits motor hum through the whole room. Leave clearance around the tube so vibration never becomes background noise every time someone vacuums.
Why a plumber’s snake can destroy vacuum tubing
Vacuum pipe walls run far thinner than plumbing pipe walls built for water pressure. A metal plumber’s snake punches straight through that thin wall and opens an invisible suction leak nobody notices until performance drops system-wide.
Clear a clog with electrician’s fish tape instead, or reverse the airflow at the power unit to push debris back out the nearest inlet.
Skipping the low voltage wire run alongside the tubing
String 20-gauge, two-conductor low voltage wire alongside the tubing as you glue each section, not after. Splice at every branch and keep wire colors consistent so polarity matches at the power unit switch.
Retrofitting that wire later means opening finished walls you just closed. Do it once, while the tubing is still exposed.
Repair or Retrofit: Your Pipes Outlast the Brand
Most suction complaints trace back to the tubing network, not the power unit. Test before you spend anything on a new motor.
Testing your existing NuTone tubing before spending anything
Run a numbered paper towel sheet through every single inlet and count how many arrive intact at the power unit’s canister. Strong suction at some inlets but weak or none at others points straight to a blocked pipe or loose fitting, not a failing motor.
Most tubing problems turn out to be one bad cut or one loose coupling, fixable in an afternoon rather than a full teardown.
Swapping the power unit while keeping every pipe
The in-wall tubing network outlasts any single power unit or brand mounted to it. Adapter kits connect existing NuTone pipe stubs to nearly any modern power unit on the market today.
One inlet covers 700 to 800 square feet of floor. A 2,800 square foot ranch with three or four inlets rarely needs new pipe when the power unit finally wears out, only a new unit bolted to the same network.
Conclusion
You started worried NuTone’s exit orphaned the pipe in your walls. It didn’t. That tubing is standard 2 inch OD PVC certified to ASTM F2158, the same spec every serious supplier still builds to, so parts stay available for as long as you own the house. Tonight, pull the hose from one inlet and shine a flashlight on the exposed pipe for that F2158 print line. No portable vacuum leaves behind an asset like that: yours will outlast whatever power unit you bolt to it next.
Frequently Asked Questions
What size tubing does a NuTone central vacuum use?
Two inch outer diameter, thin wall PVC pipe. It is built to ASTM F2158 and matches the fittings, inlets, and hose ends already installed in your walls.
Is NuTone central vacuum tubing the same as standard central vacuum pipe?
Yes. NuTone never manufactured a proprietary pipe profile, so any ASTM F2158 certified 2 inch OD tube from another supplier fits the same fittings.
Can I use regular Schedule 40 plumbing PVC instead of NuTone vacuum tubing?
Not directly. Schedule 40 is sized by inner diameter, so it needs a dedicated 2×2 adapter fitting to mate with vacuum-rated tube and inlets.
Which NuTone tubing and fitting part numbers are discontinued, and what replaces them?
3810, CF367, 3964, and 394 no longer ship from NuTone. Any certified ASTM F2158 pipe or fitting from another manufacturer replaces them without an adapter.
Do I glue NuTone vacuum pipe with primer like plumbing PVC?
No. Vacuum tubing joints get cement on the male end only, with no primer step, unlike the plumbing code most DIYers already know.