Transition Couplings
Transition Couplings: Engineered Solutions for Different Pipe Sizes
Transition Couplings deliver the original technology specifically engineered for connecting pipes with different outside diameters while maintaining superior alignment and sealing performance. Featuring either a conical shape or built in special thick rubber center stop, these couplings excel at creating reliable transitions between mismatched pipe sizes. Couplings accommodate virtually any pipe material combination including clay, plastic, cast iron, ductile iron, and asbestos cement. Available with removable filler rings (bushing/ rubber center stop) for enhanced diameter adaptation, these transition solutions eliminate the complexity traditionally associated with connecting different-sized pipes.
The integrated progression technology transforms standard pipe transitions into engineered connection points that ensure perfect alignment between dissimilar diameters while preventing pipe end damage through proper separation control. This precision-molded feature establishes ideal compression zones on both sides of the coupling, creating redundant sealing surfaces that maintain separate pressure boundaries for each pipe segment. Whether transitioning between different pipe materials or connecting modern pipe materials to legacy pipe infrastructure, these couplings deliver watertight performance that exceeds ASTM standards while withstanding over 4.3 psi hydrostatic pressure under deflection conditions.
Features
- Integrated Center Stop: Thick rubber center stop specifically designed for precise alignment between different pipe diameters.
- Diameter Transition Range: Accommodates pipe size transitions from 3" to 8" with precision-engineered fit.
- Universal Material Compatibility: Connects dissimilar materials including clay, PVC, cast iron, ductile iron, and asbestos cement.
- Removable Filler Rings: Optional diameter adaptation inserts for enhanced transition flexibility.
- Premium Hardware Options: Worm gear and nut & bolt tightening devices in 300 and 316 series stainless steel.
- Bushing Compatibility: Accepts Calder Style Bushings for specialized diameter adjustments.
- Vibration Dampening: Elastomeric design dampens vibration transfer while maintaining structural integrity.
- Regional Adaptability: Compatible with both Western Style and Eastern Style Clay Pipe systems.
- Pressure Performance: Withstands 4.3 psi hydrostatic pressure under deflection conditions.
Eliminates guesswork when connecting pipes of different sizes.
Universal Size Compatibility: Single solution handles diverse diameter transitions reducing specialized fitting inventory.
Precise Diameter Transitions: Eliminates guesswork when connecting pipes of different sizes while ensuring perfect alignment.
Enhanced Deflection Management: Functions as deflection fulcrum during ground settlement while maintaining proper pipe spacing.
Hydraulic Seal Optimization: Creates redundant sealing surfaces that prevent infiltration/exfiltration between different diameter segments.
Installation Efficiency: Rapid deployment with minimal excavation requirements compared to alternative transition methods.
Structural Protection: Prevents pipe-to-pipe contact that could compromise integrity during diameter transitions.
Cost-Effective Solutions: Eliminates specialized transition fitting inventory while reducing system downtime.
Field Adaptability: Accommodates field-cut pipes without special preparation for immediate diameter transitions.
Long-Term Performance: Superior joint performance extends infrastructure lifecycle through reliable diameter connections.
Additional Resources
Center Stop Assembly: Thick rubber center stop molded directly into coupling for diameter transition alignment.
Elastomeric Body: High-durometer rubber with superior chemical resistance for underground service.
Compression Bands: 300/316 series stainless steel bands and hardware for corrosion resistance.
Tightening Mechanisms: Available with worm gear or nut & bolt configurations for secure installation.
Optional Filler Rings: Removable inserts for enhanced diameter transition capabilities.
Compatible Bushings: Accepts Calder Style Bushings for specialized diameter adjustment applications.


ASTM C425: Complies with standard specification for compression joints for vitrified clay pipe and fittings.
ASTM C1173: Meets requirements for flexible transition couplings for underground piping systems.
ASTM A240/A240M: Stainless steel components conform to standard specification for chromium and chromium-nickel stainless steel.
UPC/IAPMO: Complies with Uniform Plumbing Code requirements as certified by the International Association of Plumbing and Mechanical Officials.
Hydrostatic Performance: Withstands 4.3 psi hydrostatic pressure under deflection conditions.
Diameter Transition Standards: Engineered for reliable connections between 3" to 8" pipe size variations.
Please reach out to us, and we can assist in getting any guides, or documentation you may need.
Email info@jointscouplings.com or Call (626)448-2100.
Please reach out to us, and we can assist in getting any guides, or documentation you may need.
Email info@jointscouplings.com or Call (626)448-2100.
Please reach out to us, and we can assist in getting any guides, or documentation you may need.
Email info@jointscouplings.com or Call (626)448-2100.