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Shielded cast iron connections
No-Hub Couplings
Shielded couplings built for no-hub cast iron pipe. A stainless steel shield and band spread clamping pressure across the gasket and pipe for a positive, hub-free joint.
Cast iron to cast iron
Standard, Medium and Heavy Duty
1½″ to 15″
Purpose-built for no-hub cast iron
Purpose-built for no-hub cast iron.
Fernco No-Hub Couplings join compatible no-hub cast iron pipe of matching or reducing diameters. The patented shield transfers clamping pressure across the gasket and pipe, creating a positive seal without a traditional hub-and-spigot joint.
Bi-Directional Shield
Patented corrugation applies sealing pressure in both parallel and transverse directions across the gasket and pipe.
Beaded Gasket
The elastomeric gasket uses positioned grooves and beads to add sealing pressure and holding power.
Interlocking Clamps
One-piece screw housings mechanically interlock with the band, removing the leak paths of staked or welded clamps.
Floating Eyelets
Floating eyelets let the clamp, band and shield move independently to help prevent shield crimping.
Stainless Steel Construction
Stainless steel shield, band and clamp components resist corrosion across plumbing applications.
Cast Iron Connection
Designed specifically to join compatible no-hub cast iron pipe to cast iron pipe.
Application: No-Hub Couplings are intended for cast iron to cast iron connections.
A full line of sizes
One shielded system, every no-hub size
From 1½″ through 15″, in Standard, Medium and Heavy Duty, plus reducing sizes for step-downs between diameters.
- Standard, Medium and Heavy Duty. Match the duty level to the job.
- Color-coded shields. Yellow marks Medium Duty and green marks Heavy Duty for quick identification.
- Straight and reducing sizes. Join equal diameters or step down between sizes.
- Stainless steel throughout. Shield, band and clamp components resist corrosion.
Choose the right duty level
No-Hub Couplings come in Standard, Medium and Heavy Duty. Higher duty levels add clamps, torque and heavier stainless steel for more demanding installations.
Standard Duty
NH Series
- 5/16″ hex-head screw
- 60 in-lb installation torque on most sizes (120 in-lb on 12″ and 15″)
- Straight and reducing configurations
- 301 stainless steel shield and band
- Sizes 1½″ to 15″
Medium Duty
MD Series
- Distinctive yellow shield
- 5/16″ hex-head screw
- 80 in-lb installation torque
- 304 stainless steel shield and housing
- Sizes 1½″ to 10″
Heavy Duty
HD Series
- Distinctive green shield
- 3/8″ hex-head screw
- 80 in-lb installation torque
- Heavier-gauge, 304 stainless steel shield and housing
- Sizes 1½″ to 10″
Specifications
Standards, construction and torque by duty level.
Standard Duty
- Conforms to CISPI 310.
- Complies with ASTM C1277.
- Gaskets meet ASTM C564.
- Torque: 60 in-lb install (120 in-lb on 12″ and 15″); 75 in-lb ultimate.
- Construction: 301 SS shield, band and housing; 305 SS screw; 300 SS eyelet.
Medium & Heavy Duty
- Conform to CISPI 310.
- Comply with ASTM C564 and ASTM C1540.
- Factory Mutual FM 1680.
- IAPMO File #3198.
- Commonwealth of Massachusetts CMR-248.
- City of New York MEA 253-98-E.
- Torque: 80 in-lb install; 100 in-lb ultimate.
- Construction: 304 SS shield and housing; 301 SS band; 305 SS screw; 300 SS eyelet.
Maximum test pressure: 4.3 psi (29.6 kPa).
Models and sizes
Select by duty level. Sizes are nominal cast iron pipe. Not sure which to order? Tell us your pipe size and we’ll confirm the fit.
Standard Duty — NH Series
Standard sizes
| Part No. | Size | Clamps | Install Torque (in-lb) |
|---|---|---|---|
| NH-150 | 1½″ | 2 | 60 |
| NH-22 | 2″ | 2 | 60 |
| NH-33 | 3″ | 2 | 60 |
| NH-44 | 4″ | 2 | 60 |
| NH-55 | 5″ | 4 | 60 |
| NH-66 | 6″ | 4 | 60 |
| NH-88 | 8″ | 4 | 60 |
| NH-1010 | 10″ | 4 | 60 |
| NH-1212 | 12″ | 6 | 120 |
| NH-1515 | 15″ | 6 | 120 |
Reducing sizes
| Part No. | Size | Clamps | Install Torque (in-lb) |
|---|---|---|---|
| NH-215 | 2″ x 1½″ | 2 | 60 |
| NH-32 | 3″ x 2″ | 2 | 60 |
| NH-42 | 4″ x 2″ | 2 | 60 |
| NH-43 | 4″ x 3″ | 2 | 60 |
Connecting different materials?
Transitioning pipe? Reach for Proflex.
No-Hub Couplings are made for cast iron to cast iron. When you need to join different materials or diameters above ground, cast iron to plastic, steel, copper and more, Proflex is the shielded transition coupling built for it, across eleven transition series from 3/4″ to 8″.
All part numbers
26 No Hub Couplings parts
Open any part for its specs, dimensional drawing and documents.
No part number matches.
HD 8
MD 8
NH 10
Common questions
What pipe do Fernco No-Hub Couplings connect?
They join compatible no-hub cast iron pipe to cast iron pipe, in matching diameters or the reducing sizes listed above. They are not intended for other pipe materials.
What is the difference between a No-Hub Coupling and a Proflex Coupling?
Both are shielded couplings, but they are built for different jobs. No-Hub Couplings are purpose-built for no-hub cast iron systems and match the codes that govern them (CISPI 310, ASTM C1277 and C1540), with Standard, Medium and Heavy Duty options. Proflex is a shielded transition coupling for above-ground DWV work: it joins different pipe materials and diameters (cast iron, plastic, steel, copper and more) and is built to ASTM C1460. Proflex can join cast iron to cast iron, so the two overlap there, but for a straight no-hub cast iron connection the No-Hub Coupling is the code-matched choice. Reach for Proflex when you need to transition between materials or pipe sizes.
What is the difference between Standard, Medium and Heavy Duty?
Duty level sets the clamp count, installation torque, screw size and stainless steel gauge. Standard Duty (NH) uses a 5/16″ screw at 60 in-lb Medium Duty (MD, yellow) adds clamps and steps up to 80 in-lb Heavy Duty (HD, green) uses a 3/8″ screw and a heavier gauge at 80 in-lb
What installation torque should I use?
Use a calibrated torque wrench. Standard Duty is 60 in-lb on most sizes and 120 in-lb on 12″ and 15″. Medium and Heavy Duty are 80 in-lb The torque for each part is listed in the tables above.
Are No-Hub Couplings shielded?
Yes. A stainless steel shield and band sit over the gasket and distribute clamping pressure across the joint, which is what makes them suitable for no-hub cast iron systems.
Documents
No-Hub sell sheet and the full Fernco Plumbing Catalog.
Need help selecting a no-hub coupling?
Tell us the cast iron pipe size and installation requirements, and our team will identify the right Standard, Medium or Heavy Duty configuration.