Type "Z" Coupling
Type Z Shielded Coupling: Engineering-Grade Pipe Connections
The Type Z Coupling provides engineering-grade pipe connections for critical sewer and drainage applications, fully compliant with the Standard Specifications for Public Works Construction Section 208-5. These high-performance couplings are specifically designed for field closure, repair, and outside diameter transitions between identical or dissimilar pipe materials in gravity sewer and drain systems.
Each coupling combines superior-grade EPDM synthetic rubber with precision-engineered stainless steel components to create connections that maintain structural integrity and leak-free performance even under extreme conditions. Laboratory-verified to withstand 150 pounds-force per inch of nominal diameter across shear loading tests while maintaining complete seal integrity, these couplings deliver uncompromising reliability for underground infrastructure projects.




Features
- Comprehensive compliance with Standard Specifications for Public Works Construction (208-5 TYPE "Z" JOINT)
- Listed on Los Angeles Bureau of Engineering Approved Product List
- Los Angeles County Sanitation District Approved
- Available for pipe sizes 4" to 12" (100 mm to 300 mm)
- EPDM synthetic rubber sleeve with 1792 psi tensile strength (exceeds 1000 psi minimum)
- AISI 316 stainless steel compression bands with integrated nut and bolt tightening devices
- 380° wrap-around stainless steel shear band (0.012" thickness)
- Synthetic rubber bushings for transitions with OD differences of 3/8" (9mm) or greater
- Three-component design: rubber sleeve, dual compression bands, and stainless steel shear band
Benefits include:
Withstands 150 lb/in shear forces during severe ground movement and soil shifts
Maintains zero leakage under 10 psi hydrostatic pressure for 10 minutes
Allows 3° deflection in any direction while maintaining seal integrity
Chemical resistance verified through rigorous 112-day immersion testing
Connects dissimilar pipe materials with secure, watertight performance
Provides field repair solutions without requiring complete pipe replacement
Meets rigorous municipal standards for public works infrastructure
Additional Resources
The coupling consist of three components as follows
a) A circular synthetic rubber sleeve meeting the physical, chemical and bacteriological requirements of the Type “Z” Joint. The sleeve shall confirm to 208-1.2.
b) Two stainless steel compression bands (AISI 316) with stainless steel nut and bolt (any AISI Series 300) type tightening devices and meeting the requirements of ASTM A240.
c) A stainless steel shear band shall wrap around the joint a minimum of 380 degree. Welded to the shear band shall be two stainless steel nut and bolt tightening devices or worm drive tightening devices fabricated from any 300 series stainless steel and meeting the requirements of the compression band above.
The minimum shear and thickness shall be 0.012 inches (0.30 mm). minimum shear band width shall be 2.120 inches (54.0 mm) for 4-inch and 6-inch (100 mm and 150 mm) diameter pipe sizes and 2.437 inches (62.0 mm) for 8-inch through 12-inch (200 mm through 300 mm) diameter pipe sizes.


Construction Standards
- Standard Specifications for Public Works Construction (SSPWC/Greenbook):
- Fully compliant with Section 208-5 TYPE "Z" JOINT specifications
- Rubber components conform to Section 208-1.2 requirements
- Chemical resistance testing per SSPWC 211-2 protocols
Material Standards
- ASTM A240: Compliance for stainless steel compression bands and shear bands
- ASTM C1173
- ASTM 425
- UPC / IAPMO
- AISI Standards:
- Type 316 stainless steel for compression bands
- Series 300 stainless steel for nuts, bolts, and tightening devices
Municipal Approvals
- City of Los Angeles Bureau of Engineering: Listed on the Approved Product List [📃 View]
- Los Angeles County Sanitation District: Approved for use in sanitation systems
01 Series Specs.

Clay to Clay
02 Series Specs.

Clay to Cast Iron / Plastic / PVC
03 Series Specs.

Clay to Asbestos Cement / Ductile Iron / C900
04 Series Specs.

Concrete to Concrete
06 Series Specs.

Concrete to Cast Iron / Plastic / PVC
07 Series Specs.

Clay to Concrete
51 Series Specs.

Asbestos Cement / Ductile Iron / C900 to Cast Iron / Plastic / PVC
55 Series Specs.

Asbestos Cement / Ductile Iron / C900 to Asbestos Cement / Ductile Iron / C900
56 Series Specs.

Cast Iron / Plastic / PVC to Cast Iron / Plastic / PVC