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Created on 09.14
No-Hub Couplings
No-hub couplings are engineered to connect no-hub cast iron pipe in plumbing and drainage applications, providing a reliable, code-compliant alternative to traditional hub-and-spigot joints. The coupling features a patented shield design that ensures maximum transfer of clamping pressure from the stainless steel clamps to the elastomeric gasket and pipe surface, delivering a positive, leak-free seal.
Features
Patented Bi-Directional Shield Design
The coupling shield is engineered with a patented bi-directional corrugation pattern that adjusts to accommodate a variety of pipe diameters and circumferences — effectively eliminating potential leak paths. The corrugation seals pressure in both parallel and transverse patterns against the gasket and pipe surface, providing a positive and reliable seal under varying installation conditions.
Cast Iron-to-Cast Iron Connection
No-hub couplings offer a long-lasting, code-approved method for connecting cast iron pipe to cast iron pipe — without the need for a traditional hub-and-spigot joint. This simplifies installation, reduces labor time, and provides flexibility in system design and modification.
Specially Beaded Gasket
Meeting the requirements of ASTM C564, the beaded gasket is manufactured from a high-performance elastomeric compound featuring strategically positioned grooves and beads along its inner surface. When the clamps are tightened, the shield seats into the grooves, creating multiple sealing lines that deliver exceptional sealing pressure and holding power — even under differential movement or thermal cycling.
Interlocking Clamp Design
The stainless steel clamps feature a one-piece screw housing that mechanically interlocks with the band. This design eliminates the leak paths that can occur in staked or welded clamp constructions, ensuring a structurally superior and leak-resistant clamp assembly.
Floating Eyelet Design
The floating eyelets fasten the clamps to the shield while allowing the clamp, band, and shield to move independently of one another. This freedom of movement prevents the shield from crimping or distorting during installation and under load — a common cause of future leakage in rigidly attached shield designs.
Specifications
Standard No-Hub Couplings
Parameter | Specification |
Screw size | 5/16" hex-head |
Installation torque | 60 in.-lbs. applied to the band/shield assembly |
Coupling standard | CISPI 310 |
Compliance | ASTM C1277 |
Gasket material | Elastomeric compound meeting ASTM C564 |
Medium-Duty (MD) No-Hub Couplings
The distinctive yellow shield provides quick visual identification of Medium-Duty couplings, simplifying jobsite inspection and compliance verification.
Parameter | Specification |
Screw size | 5/16" hex-head |
Installation torque | 80 in.-lbs. applied to the band/shield assembly |
Coupling standard | CISPI 310, Factory Mutual CN 1680 |
Compliance | ASTM C564, ASTM C1540, IAPMO File #3198, Commonwealth of Massachusetts CMR-248, City of New York MEA 253-98-E |
Gasket material | Elastomeric compound meeting ASTM C564 |
Heavy-Duty (HD) No-Hub Couplings
The distinctive green shield provides quick visual identification of Heavy-Duty couplings, simplifying jobsite inspection and compliance verification.
Parameter | Specification |
Screw size | 3/8" hex-head |
Installation torque | 80 in.-lbs. applied to the band/shield assembly |
Ultimate torque rating | Exceeds 100 in.-lbs. |
Shield material | Heavier-gauge stainless steel for enhanced durability |
Coupling standard | CISPI 310, Factory Mutual EN 1680 |
Compliance | ASTM C564, ASTM C1540, IAPMO File #3198, Commonwealth of Massachusetts CMR-248, City of New York MEA 253-98-E |
Gasket material | Elastomeric compound meeting ASTM C564 |
Maximum test pressure | 4.3 PSI (29.6 kPa) |
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